An update to my post above. I tried using a gmail.com address and that isn’t refused, but the SMTP envelope is reported as
Return-Path: <yyyyyyyyy@localhost>
So the symptoms I’m seeing could be to do with tight rules at AOL and something in the standard configuration of Postfix. I’ve not seen this problem with any web applications that do user registration like this.
I’ve just encountered this with 0.8.3.1. As the mail server administrator I was getting delivery failure notifications which reported that the receiving SMTP host had rejected the email with:
<xxxxx@aol.com>: host mailin-04.mx.aol.com[64.12.138.57] said: 501 SYNTAX
ERROR IN PARAMETERS OR ARGUMENTS (in reply to MAIL FROM command)
I increased logging on Postfix and tested it and found:
mailin-04.mx.aol.com[64.12.138.57]: MAIL FROM:<yyyyyyyy@localhost>
mailin-04.mx.aol.com[64.12.138.57]: 501 SYNTAX ERROR IN PARAMETERS OR ARGUMENTS
Where ‘yyyyyyyy’ is the mail server’s local user account for the domain doing the sending.
It looks as if the AOL server is rejecting the @localhost part of the MAIL FROM field. I’ve looked in the bbPress config.php and in the administration options of the dashboard but can’t see why bbPress is using localhost.
