Jul 13 22:26:42 graysonpeddie postfix/smtpd: connect from 3dgameman.com[18.104.22.168]
Jul 13 22:26:43 graysonpeddie postfix/smtpd: NOQUEUE: reject: RCPT from 3dgameman.com[22.214.171.124]: 450 4.1.8 : Sender address rejected: Domain not found; from= to=<(withheld)_at_graysonpeddie.com> proto=ESMTP helo=<3dg.3dgameman.com>
Jul 13 22:26:43 graysonpeddie postfix/smtpd: disconnect from 3dgameman.com[126.96.36.199]
This is my subset of Postfix's main configuration file:
content_filter = smtp-amavis:[127.0.0.1]:10024
smtpd_delay_reject = yes
smtpd_helo_required = yes
If you add 3dg as a CNAME record for 3dgameman.com, this might help clear up my problem. Does "3dg" belong to a mail server?
By the way, just have your mail server send a HELO 3dgameman.com instead of HELO 3dg.3dgameman.com. That would certainly make a lot of sense because with policies implemented in my Postfix server, Postfix will check to see if 3dg.3dgameman.com exists. If not, then the e-mail will be rejected once it came back with a "404 Not Found."
TIP: Since I can tell that you are using Postfix in your Ubuntu Server (by means of telnetting to 3dgameman at port 25), you can modify "myhostname" from 3dg.3dgameman.com to 3dgameman.com. That way, mail from unverified domains (domains that are invalid) get rejected in an attempt to reduce spam.
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