Saturday, August 11, 2012

My email bounce or I get non-delivery reports... Has my email server been blacklisted ?

It's easy to check... Go to MxToolBox website and run blacklist check there.

You need to know your email server public / internet side IP address. Most of email servers are located behind some sort of a router / firewall internet appliance so if you do not know your fully qualified domain name (FQDN) you can Google search "my ip address" withing your mail server network and see if your public address shows up under search result.

Keep in mind that non-delivery reports you've experienced and possible blacklisting could be due to other factors including changes in your mail server configuration or anti-spam policies on a receiving end, not to mention email spoofing or infection which could have send hundreds of emails on your behalf triggering mass alarm on a receiver end... Read your non-delivery reports and error logs carefully!   


  1. Hm, i never read delivery report, but from now on i will. Thanks for the info!

    1. I do not know if you had sadistic smile on your face at the time you were leaving your comment but I thank you for leaving it anyway:)

  2. another good blacklist lookup tool. once you do an initial scan by hostname or ip (ip is better, searches more blacklists) it then gives you a drop down of associated ips to scan. pretty slick.

  3. There are different ways on handling spam emails like checking the email address of the sender, the header, subject, attachments included in the email, and mostly the message of your email. Other than that the user has the option who he will add to the spam database.

    email delivery