E-mail marked as spam

How to help prevent outgoing e-mail from being marked as spam

We use many different techniques to filter spam. Spammers constantly adapt to these anti-spam measures, so we have to continually modify server configurations to help reduce spam. Some techniques are:

– SPF (Sender Policy Framework) records
– DKIM (DomainKeys Identified Mail)
– Reverse DNS 

Nevertheless, there are still some things you can do to help improve the odds of successful delivery. Try the following techniques:

  • If possible, do not send HTML-only messages (send plain-text messages instead, or multi-part MIME messages with a text/plain component).
  • If you do send HTML-only messages, make sure they use valid HTML markup. You can use the W3C Markup Validation Service to test content (you can test a URL, upload a file, or paste HTML into a text box).
  • Avoid using lots of exclamation marks (!) or dollar signs ($) in the message subject.

Sending e-mail to free e-mail providers

Free e-mail providers such as Yahoo and Hotmail reject messages based on spam reports or a poor IP address reputation. So the more engaged your recipients are with your messages, the better. For example, when your recipients open and read your messages, or pull them out of the spam folder into their inboxes, these are positive indications to the provider that the messages are legitimate.

There are several additional things you can do to improve the chances that your e-mail messages are delivered successfully to recipients who use free e-mail providers:

Gmail
MSN and Hotmail
EarthLink

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