Racker Hacker

To send e-mail properly to AOL and Hotmail, three things must match:

• Your IP must have reverse DNS.
• If you ask for the forward DNS record for the reverse, it must match.
• Your mail server’s HELO must match the DNS records.

If you need to test your setup, use these commands.

$ host mhtx.net
mhtx.net has address 209.61.157.17
$ host 209.61.157.17
17.157.61.209.in-addr.arpa domain name pointer mhtx.net.
$ telnet 209.61.157.17 25
Trying 209.61.157.17…
Connected to mhtx.net.
Escape character is ‘^]’.
220 mhtx.net ESMTP Postfix

This entry was posted on Tuesday, February 27th, 2007 at 11:05 am and is filed under Mail.You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.