Knowledgebase : eMail > SMTP Relay

Spamming from DNN4Less is strictly FORBIDDEN.

If you would like to report eMail abuse, please send an eMail to:info @
DNN4Less [dot] com.

If you are caught spamming or otherwise abusing your eMail account privileges, your account will be terminated immediately!

This statement applies to DNN4Less services that display or link to this notice (“Services”). DNN4Less prohibits the use of the Services in any manner associated with the transmission, distribution or delivery of any unsolicited bulk or unsolicited commercial e-mail ("Spam"). You may not use any Services to send Spam. You also may not deliver Spam or cause Spam to be delivered to any of DNN4Less's Services or customers.

In addition, eMail sent, or caused to be sent, to or through the Services may not:

  • Use purchased lists.
  • Use or contain invalid or forged headers.
  • Use or contain invalid or non-existent domain names.
  • Employ any technique to otherwise misrepresent, hide or obscure any information in identifying the point of origin or the transmission path.
  • Use other means of deceptive addressing.
  • Use a third party's internet domain name, or be relayed from or through a third party's equipment, without permission of the third party.
  • Contain false or misleading information in the subject line or otherwise contain false or misleading content.
  • Fail to comply with additional technical standards described below.

DNN4Less does not authorize the harvesting, mining or collection of eMail addresses or other information from or through the Services. DNN4Less does not permit or authorize others to use the Services to collect, compile or obtain any information about DNN4Less’s customers or subscribers, including but not limited to subscriber eMail addresses, which are DNN4Less's confidential and proprietary information. Use of the Services is also subject to the applicable Privacy Statement and Terms of Use.

If DNN4Less believes that unauthorized or improper use is being made of any Service, it may, without notice, take such action as it, in its sole discretion, deems appropriate, including blocking messages from a particular internet domain, mail server or IP address. DNN4Less may immediately terminate any account on any Service which it determines, in its sole discretion, is transmitting or is otherwise connected with any e-mail that violates this policy.

Nothing in this policy is intended to grant any right to transmit or send eMail to, or through, the Services. Failure to enforce this policy in every instance does not amount to a waiver of DNN4Less's rights.

Unauthorized use of the Services in connection with the transmission of unsolicited eMail, including the transmission of eMail in violation of this policy, may result in civil, criminal, or administrative penalties against the sender and those assisting the sender.


Any customer found to be using DNN4Less for spam will have their service immediately terminated.
If you know of or suspect any violators, please notify us immediately at admin @
DNN4Less [dot] net


Definition of Spam

The word "Spam" as applied to eMail means Unsolicited Bulk eMail ("UBE").

Unsolicited means that the Recipient has not granted verifiable permission for the message to be sent. Bulk means that the message is sent as part of a larger collection of messages, all having substantively identical content.

A message is considered Spam only if it is both Unsolicited and Bulk:
  (1) Unsolicited eMail is normal eMail: (examples: first contact enquiries, job enquiries, sales enquiries)
  (2) Bulk eMail is normal eMail: (examples: subscriber newsletters, customer communications, discussion lists)


Technical Definition of Spam

An electronic message is "Spam" if:
  (1) The recipient's personal identity and context are irrelevant because the message is equally applicable to many other potential recipients;


  (2) The recipient has not verifiably granted deliberate, explicit, and still-revocable permission for it to be sent.

Spam is an issue about consent, not content. Whether the UBE message is an advert, a scam, porn, a begging letter or an offer of a free lunch, the content is irrelevant - if the message was sent unsolicited and in bulk then the message is Spam.

Spam is not a sub-set of UBE, it is not "UBE that is also a scam or that doesn't contain an unsubscribe link", all eMail sent unsolicited and in bulk is Spam.

This distinction is important because legislators spend inordinate amounts of time attempting to regulate the content of spam messages, and in doing so come up against free speech issues, without realizing that the spam issue is solely about the delivery method.


Sending Spam violates the Terms of Service/Acceptable Use Policy (ToS/AUP) of almost all Internet Service Providers.

Various jurisdictions have implemented legislation to control what they call "Spam". One particular example is US S.877 (CAN-SPAM 2004). Each law addresses "Spam" in different ways, and as a consequence, often has different definitions of what they cover, whether they call it "Spam" or not. DNN4Less uses the industry standard "unsolicited bulk email" definition which underlines "it's not about content, it's about consent". As such, arguments as to whether UBE messages are covered under CAN-SPAM or are compliant with CAN-SPAM, are entirely irrelevant.

ISP Feedback Loops

DNN4Less participates in all major ISP Feedback Loop (fbl) and is registered with the Network Abuse Clearing House (
Any Feedback complaints will received will forwarded to the senders account.

All customers utilizing our SMTP Relay Service MUST comply with the following:
  • All mailing lists must be generated from a "Opt-In" mechanism.
  • All mailings must include a means for the user to quickly and easily "Opt-Out" from ALL future mailings.
  • If you receive a Feedback complaint, you should treat it as a "Opt-Out" request and remove the recipient from ALL future mailings.

If we received an unacceptably high number of complaints (over 0.5%, 5 complaints per 1,000 messages), your account may be disabled until we can contact you to discuss your mailing list.


Customers utilizing our SMTP Relay Service to send bulk eMail may ONLY send to recipients who have an existing and provable relationship with the sender, and that the recipient has not requested to be opted out from future mailings.  Details as the date and time when the eMail address as obtained along with the IP address of the subscriber and the web site they visited to sign-up must be made available to DNN4Less upon request.

You may NOT utilize any purchased lists.

DNN4Less retains the rights to perform periodic audits of eMail, complaints and bounced messages. 


Opt-Out Mechanism

Customers utilizing our SMTP Relay Service to send bulk eMail MUST provide a quick and simple “Opt-Out” mechanism on every outgoing message. The exact implementation details is at the customers discretion, however we would recommend the following:

  • Within the “Opt-Out” section of the message, the sender should include verbiage such as “This message was sent to <Recipient Address>. If you wish to Opt-Out of any future eMailings…”.
  • To comply with the “ISP Feedback Complaints” policy and remove the recipient from future mailings, the sender should implement the following:
    (a) Only specify one recipient per message.
    (b) Have a means of correlating individual “Message-ID” to a given recipient OR including the recipients information within the message body (as noted in bullet 1).


The CAN-SPAM Act: A Compliance Guide for Business

The CAN-SPAM Act, a law that sets the rules for commercial email, establishes requirements for commercial messages, gives recipients the right to have you stop emailing them, and spells out tough penalties for violations.Despite its name, the CAN-SPAM Act doesn’t apply just to bulk email. It covers all commercial messages, which the law defines as “any electronic mail message the primary purpose of which is the commercial advertisement or promotion of a commercial product or service,” including email that promotes content on commercial websites. The law makes no exception for business-to-business email. That means all email – for example, a message to former customers announcing a new product line – must comply with the law.Each separate email in violation of the CAN-SPAM Act is subject to penalties of up to $16,000, so non-compliance can be costly. But following the law isn’t complicated. Here’s a rundown of CAN-SPAM’s main requirements:

  • Don’t use false or misleading header information. Your “From,” “To,” “Reply-To,” and routing information – including the originating domain name and email address – must be accurate and identify the person or business who initiated the message.Don’t use deceptive subject lines. The subject line must accurately reflect the content of the message.Identify the message as an ad. The law gives you a lot of leeway in how to do this, but you must disclose clearly and conspicuously that your message is an advertisement.Tell recipients where you’re located. Your message must include your valid physical postal address. This can be your current street address, a post office box you’ve registered with the U.S. Postal Service, or a private mailbox you’ve registered with a commercial mail receiving agency established under Postal Service regulations.Tell recipients how to opt out of receiving future email from you. Your message must include a clear and conspicuous explanation of how the recipient can opt out of getting email from you in the future. Craft the notice in a way that’s easy for an ordinary person to recognize, read, and understand. Creative use of type size, color, and location can improve clarity. Give a return email address or another easy Internet-based way to allow people to communicate their choice to you. You may create a menu to allow a recipient to opt out of certain types of messages, but you must include the option to stop all commercial messages from you. Make sure your spam filter doesn’t block these opt-out requests.Honor opt-out requests promptly. Any opt-out mechanism you offer must be able to process opt-out requests for at least 30 days after you send your message. You must honor a recipient’s opt-out request within 10 business days. You can’t charge a fee, require the recipient to give you any personally identifying information beyond an email address, or make the recipient take any step other than sending a reply email or visiting a single page on an Internet website as a condition for honoring an opt-out request. Once people have told you they don’t want to receive more messages from you, you can’t sell or transfer their email addresses, even in the form of a mailing list. The only exception is that you may transfer the addresses to a company you’ve hired to help you comply with the CAN-SPAM Act.
  • Monitor what others are doing on your behalf. The law makes clear that even if you hire another company to handle your email marketing, you can’t contract away your legal responsibility to comply with the law. Both the company whose product is promoted in the message and the company that actually sends the message may be held legally responsible.

DNN4Less maintains logs of all messages sent through our servers and will provide such logs to the proper authorities upon request. 

For additional information on the CAN-SPAM Act, please refer to the following U.S. Government sites:


Policy Update

We may make changes to our policies from time to time. When we do, those changes will be reflected directly and immediately in this document so our users are always aware of what information we collect, how we use it, and under what circumstances, if any, we disclose it. We encourage you to review our policies whenever you visit our Web site. In the event of an acquisition, sale or other change in ownership of DNN4Less, collected information may be transferred or disclosed to the acquiring party. 

This policy was last updated on December 21, 2010.


Agreement to Provide Service

For purposes of this Agreement the term "Services" means interactive computer services based on the Microsoft Platform and other services (as operated by DNN4Less) including without limitation (i) the distribution of third party software to Client and (ii) the storage of Client's data and information and the transmission to Client of Client's data and information used by such software applications (the "Client Information"). DNN4Less agrees to use commercially reasonable efforts to provide the Services to Client. Client agrees that it is responsible for software products necessary to transmit Client Information to DNN4Less. Client represents and warrants to DNN4Less that it will use any software provided by DNN4Less consistent with the terms of the software license agreement supplied with the product.

No Long Term Contracts

Excluding customers who have signed a set period contract, you may cancel your service at any time by contacting us via mail or eMail. All correspondence must include your first & last name, phone number or eMail address and Customer ID. 

DNN4Less may terminate this Agreement or the Services for any customer at any time with or without cause, and with or without notice. Upon termination by DNN4Less for reason other than violation of the Anti-Spam policy, DNN4Less will provide the customer with a proportionate refund of the advance monthly payments which DNN4Less has received for the then-current month following the date of termination. DNN4Less does not provide partial month refunds for the then-current month. Except for such refund, DNN4Less shall have no liability to you or any third party because of such termination. If DNN4Less terminates this agreement because you violated the Anti-Spam policy, no refund will be issued.


DNN4Less may delete any of your archived data immediately after account termination. All sections of this Agreement which by their nature should survive termination will survive termination, including, without limitation, ownership, warranty disclaimers and limitations of liability.


Satisfaction Guarantee

We offer a 99.999% Uptime Guarantee!

If for any reason, you are not completely satisfied with our service, we will give you a full refund within two week of signing up and before sending/receiving a total of 1,000 messages.

  • Once you have passed your two week period (14 days) or have successfully sent or received a total of 1,000 messages (whichever is sooner) no refund will be granted
  • This guarantee only covers newly created accounts (not renewal or upgrades)
  • If your account is terminated or disabled due to non-compliance with our Anti-Spam policy, no refund will be granted

Payment Terms

Client agrees to pay DNN4Less's then-current prices and fees for the Services provided by DNN4Less during the applicable billing period in US dollars (US$). Client hereby authorizes DNN4Less to charge Client's credit card for the amounts due, if that is the method of payment preferred by the Client. DNN4Less may change its prices and fees from time to time. Client acknowledges that some amounts due DNN4Less will be billed monthly and other amounts will be billed on an alternative schedule. Client further acknowledges that it is responsible for all amounts and charges, including applicable taxes and purchases made by Client or an Authorized User. An Authorized User is a person authorized and designated by Client to receive or request Services. Client agrees to notify DNN4Less immediately of any billing problems or discrepancies within 30 days. If Client does not provide such notice to DNN4Less during such 30-day period, Client agrees that it waives its right to dispute such problems or discrepancies. Additionally, if any charges are being collected by DNN4Less for the benefit of Client from a supplier or service provider, then Client agrees to pay DNN4Less for all such charges and agrees that DNN4Less may charge such charges to Client's credit card, if applicable. Client acknowledges that it is responsible for paying all charges (including without limitation telephone charges), applicable taxes and other fees charged to Client by third parties in connection with the provision of the Services.


Overage Billing

"Overage" is defined as usage of the services provided by DNN4Less to you in excess of the allocated limitation. Overages are charged for services and professional fees (administrative time) used in excess of the amount allocated to your account. 

You agree to pay the then-current overage fees and charges for the
DNN4Less services, including overage fees, upon receipt of an invoice.
Overage charges are billed at 150% of your current rate in blocks of 1,000 recipients. 

Overage fees can be avoided by subscribing to a higher service plan.


Finance Charges and Collections

Payments are due (5) days after presentation of invoice. Should payment in full of any invoice (aside from such shortfalls) not be received by DNN4Less within five (5) days after presentation, DNN4Less will impose a debt service charge amounting to one and a half percent (1.5%) of the overdue balance for each month or fraction thereof the overdue amount remains unpaid (18% APR). 

Failure to pay because service has been cancelled or suspended in no way relieves the Customer's obligations to make full payment. Finance charges will continue to accrue. 

If your account becomes past due, we may use a collection agency to recover the amount due. You will be responsible for all collection costs and attorney fees associated with your account.


No Warranty



Limitation of Liability



Intellectual Property

All content on this site is protected by United States copyright law, and may not be copied in whole or in part without the express written permission of DNN4Less, which reserves all rights. The reuse of any DNN4Less content (information, graphics, audio, coding) online or otherwise for any purpose is strictly prohibited. All materials contained on this site are protected and may not be reproduced, distributed, displayed, published, transmitted or broadcast without the prior permission of DNN4Less. Alteration or removal of any trademarks, copyright or other notices from copies of the content is not allowed. Permission to use DNN4Less content is granted on an individual basis. Violation of this policy may result in copyright, trademark, or other intellectual property rights violation and subject you to civil or criminal penalties.



Client agrees to defend, indemnify and hold harmless DNN4Less and its suppliers from and against any and all third-party claims, actions or demands and resulting liabilities, losses, damages, costs and expenses, (including reasonable attorneys fees) of whatever nature or kind arising out of or in connection with: (1) the use of the Services by Client or any authorized user, (2) any acts or omissions of Client or an authorized user, or any breach of a representation or warranty made by Client in this Agreement. This indemnification includes any cause of action brought against DNN4Less that is based in whole or in part on a claim that DNN4Less is negligent in relation to provision of the Services to Client or an Authorized User. Client's obligation to indemnify DNN4Less and its suppliers will survive the expiration or termination of this Agreement.



This site is controlled and/or operated by DNN4Less from its offices within the State of Maryland, United States of America. DNN4Less makes no representation that materials in this site are appropriate or available for use in other locations outside the United States. Unless otherwise expressly stated, advertising and related materials made available through this site, or through any site displaying the authorized DNN4Less logo, or otherwise linked to this site are intended only for presentation within the United States, its territories and protectorates. Those who choose to access this site from other locations do so on their own initiative and without warranty or recourse except as provided for by United States law.


Choice of Law

This Agreement shall be governed by, construed and enforced in accordance with the laws of the State of Maryland, without regard to its conflicts of law principles. Any action brought to enforce this Agreement or, in connection with, any matters related to this Site, shall be brought only in either the State or Federal courts located in Maryland, and you expressly consent to the jurisdiction and venue of said courts. This Agreement shall not be governed by the UN Convention on Contracts for the International Sale of Goods, the application of which is hereby excluded. If any provision of this Agreement shall be unlawful, void, or for any reason unenforceable, then that provision shall be deemed severable from this Agreement and shall not affect the validity and enforceability of any remaining provisions. You also acknowledge and agree that DNN4Less will fully cooperate with any law enforcement authorities or court order requesting or directing DNN4Less to disclose information or materials in our possession.


Assignment and Succession

You may not grant, devise, or otherwise assign any rights or benefits under this Agreement to any other party. Notwithstanding any other provision of this Agreement, DNN4Less, its successors and assigns may fully enforce any term or provision of this Agreement, and all rights and benefits shall inure to such successors and assigns, with or without prior notice.


Credit Verification

You authorize DNN4Less to obtain information about your credit history as part of DNN4Less activation process. DNN4Less reserves the right to request information for approval purposes and to refuse service to any applicant for any reason.


Changes in Service

DNN4Less reserves the right to change the availability of or make modifications, deletions, or additions to it’s service offerings at any time without prior notice.


Policy Update

We may make changes to our policies from time to time. When we do, those changes will be reflected directly and immediately in this document. We encourage you to review our policies whenever you visit our Web site. In the event of an acquisition, sale or other change in ownership of DNN4Less, collected information may be transferred or disclosed to the acquiring party. 

This policy was last updated on December, 21 2010.

SMTP Relay Account
The following instructions are provided for customers who have an SMTP Relay Account. If you do not have an account and would like more information, please contact our Sales Department.

Error Message
451 Requested action aborted: This mail account has sent too many messages in a short amount of time. Please try later.

If you receive this error when attempting to send an eMail campaign, it means that you are sending messages faster than your SMTP Relay Service plan allows.

SMTP Relay Service plans have three items that define their limits:

  1. How many recipients you are allowed to send messages to per month. 
  2. How many recipients you are allowed to send messages to per hour.
  3. How many sending domains you are allowed to use.

To resolve this issue, you have two options:

  1. Throttle your eMail software so that it sends messages slower. 
  2. Upgrade your account to a service plan that meets your required sending levels. 


Configure your email client or DotNetNuke SMTP Server as follows:

Authentication ID:  ######@DNN4Less
Password:  #######
Smart Host:
Authentication Method:  Basic

The values for your Authentication ID and password will be provided to you after your SMTP relay account has been created.  These settings may be used on all DotNetNuke websites under your account.  If you are on either single or multiple virtual server, dedicated servers, one SMTP Relay service will be sufficient for all the domains on all of your servers.

Following are two Agreements/policies, apply to all SMTP Relay Service Clients:




The following instructions are provided for customers who have an SMTP Relay Account. If you do not have an account and would like more information, please contact DNN4Less Sales.


  1. Open Apple Mail.
  2. At the bottom left of the main form, press the configuration drop down and select "Edit (your account)." 
    (You can also select Mail Preferences from the Main Men

  3. On the "Accounts" dialog, select the desired account you wish to modify within the list on the left, then select "Edit SMTP Server List" drop down next to the "Outgoing Mail Server (SMTP)" label.

  4. Select the "Account Information" tab, then in the "Server Name" box, enter the name of the Smart Host provided in your welcome letter.

  5. Select the "Advanced" tab, then enter the "User Name" (aka User ID) and "Password" that was provided in your welcome letter.

  6. Press "OK" to close the SMTP Server List Dialog.
  7. Close the Accounts Dialog.

You should now be able to send eMail through DNN4Less eMail's SMTP Relay Service.

The following instructions are provided for customers who have an SMTP Relay Account. If you do not have an account and would like more information, please contact DNN4Less Sales.


  1. Open Outlook 2010.
  2. From the Main Menu, select "Tools" then "Account Settings"

  3. From the "Account Settings" dialog, select the "E-mail" tab, then select the eMail account you wish to edit and press the "Change" button.

  4. In the "Outgoing mail server (SMTP)" textbox, enter the name of the Smart Host provided in your welcome letter.
  5. Under the "Logon Information" enter the "User Name" and "Password" provided in the welcome letter and CHECK "Remember Password".

  6. Press the "Next" button.
  7. Press the "Finish" button to close the Change E-mail Account dialog box.
  8. Press the "Close" button to close the Account Settings dialog.

You should now be able to send eMail through DNN4Less eMail's SMTP Relay Service.

What is a feedback loop?
A feedback loop (FBL), sometimes called a complaint feedback loop, is an inter-organizational form of feedback by which an internet service provider (ISP) forwards the complaints originating from their users to the sender's organizations.

DNN4Less subscribes to and activily monitors all the major feedback loops (partial list):


DNN4Less has also registered our  address with the Network Abuse Clearing House (

For more information regarding our position on Feedback Loops, please review our Anti-Spam Policy.

This article presents an easy method of transferring email from one server to another, using matching IMAP email accounts in your favorite local email software. This is important because when you migrate to a new server, your old emails will not be available unless you migrate them.

You will transfer emails from a single mail account on one server to another. Using IMAP avoids formatting and permissions problems that may result from moving the raw mail files.


  • Both of your servers must support IMAP email. 
  • The password for the email account you are trying to migrate.
  • An IMAP-capable local email client. Most email clients like Outlook, Apple Mail, and Thunderbird support IMAP mail accounts.
    • If you don't have a favorite email client, download Thunderbird for free.


  1. Create the same email account on your new server that you had on your old server. Use the same spelling and capitalization.
  2. Give the new email account the same password that you used on your old server. You can change the password after the migration process is done, if desired.
  3. In your local email client, create two new email accounts.
    1. They will both be for the same email address.
    2. They will both use the same password.
    3. They must both use IMAP.
    4. The incoming server (or IMAP server) will be different for each account.
  4. With both accounts online, open up the inbox for the account that connects to your old server. Drag and drop messages from this inbox to the inbox on your new server.

The Sender Policy Framework (SPF) is an open standard specifying a technical method to prevent sender address forgery. More precisely, the current version of SPF — called SPFv1 or SPF Classic — protects the envelope sender address, which is used for the delivery of messages.

Like paper mail letters, e-mail messages have at least two kinds of sender addresses: one on the envelope and one in the letterhead:


  • The envelope sender address (sometimes also called the return-path) is used during the transport of the message from mail server to mail server, e.g. to return the message to the sender in the case of a delivery failure. It is usually not displayed to the user by mail programs.
  • The header sender address of an e-mail message is contained in the "From" or "Sender" header and is what is displayed to the user by mail programs. Generally, mail servers do not care about the header sender address when delivering a message.

(There are other solutions that protect the header sender address or that do not care at all about who sent the message, only who originally wrote it.)

Even more precisely, SPFv1 allows the owner of a domain to specify their mail sending policy, e.g. which mail servers they use to send mail from their domain. The technology requires two sides to play together: (1) the domain owner publishes this information in an SPF record in the domain's DNS zone, and when someone else's mail server receives a message claiming to come from that domain, then (2) the receiving server can check whether the message complies with the domain's stated policy. If, e.g., the message comes from an unknown server, it can be considered a fake.

For more information, please visit the official SPF website:

Updating your SPF record for use with our "Standard SMTP Relay Service" plans:

If your company has defined an SPF record and you are using our Standard SMTP Relay Service, you should update your SPF record to include our servers: 

Example: IN TXT "v=spf1 ?all"

For more information, please review the SPF Record Syntax:

SPF Wizard

For additional assistance in setting up an SPF record, visit

Many ISPs (Internet Service Providers) are blocking the standard SMTP port (tcp port 25) which is the port used to send eMail. They are doing this to cut down on the amount of SPAM that is sent from their networks.

Most eMail sent via the Internet is routed through the tcp port 25, the channel used for communication between an eMail client and an eMail server. Even though tcp port 25 blocking will probably become an industry standard, this practice can create problems for eMail servers and block legitimate eMail as well as SPAM.

NOTE: You may notice when you attempt to send eMail, that your connection is times out (connection timeout).  If everything else is working,  tcp port 25 blocking is a typical cause.

Here is how you can check to see if tcp port 25 is blocked on your network:

  1. Open a Command Prompt and enter:
    >telnet 25
  2. View Results:
    1. If tcp port 25 is unblocked, you receive a successful 220 response:

      Connected to
      220 ESMTP MAIL Service, Version: 6.0.3790.3959 ready at Tue, 15, Sep 2009 12:11:31 -0400
    2. If tcp port 25 is blocked you will get a connection error or no response at all:

      telnet: connect to address Connection refused.
      telnet: Unable to connect to remote host


DNN4Less offers customers the ability to send outbound eMail via alternate port 2525.

When configuring your client software, there may be a specific box that indicates the port that should be used when sending eMail.  If it has not been modified, the port will be listed as 25.  By simply changing this number to 2525, your should be able to successfully send outbound eMails to our servers.

In situations where a box to specify the port number is not available, try entering “:2525” after the SMTP host name…  Example: “”.