I have implemented many of your server suggestions including mailscanner, etc. Recently I created a new e-mail account via cpanel and did some testing. I am getting a unusual bounce and hope you can point me the right direction as I looked at several files and don't see why this is not geting through.
Below is what I get returned to my sending e-mail address. I have changed the addresses for public use...
----- The following addresses had permanent fatal errors -----
(reason: 550-X-RBL-Warning: 220.127.116.11 is in a blacklist at spam.dnsbl.sorbs.net.)
----- Transcript of session follows -----
... while talking to mydomain.com.:
<<< 550-X-RBL-Warning: 18.104.22.168 is in a blacklist at spam.dnsbl.sorbs.net.
<<< 550 http://www.dnsbl.us.sorbs.net/cgi-bi...IP=22.214.171.124
550 5.1.1 <email@example.com>... User unknown
<<< 503 valid RCPT command must precede DATA
It appears the IP 126.96.36.199 is one of the servers from my ISP (RoadRunner) that passes the message to my server, and my server is not accepting the message.
I checked my rules list bit don't see that I am using sorbs.net for blacklists. So it must be in a file I am not seeing.
Anything else you can tel me about the above error? I can send e-mail to the new address from several other accounts, even gmail and hotmail that sometimes get blocked.
Thanks in advance for any input.