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
