FYI for the list: Changing the setting described below in iMS POST config seems to have fixed the problem.
> ----- aaa Original Message ----- > Oh, one other change I'm making: there was no default server name set > up in iMS POST, and the machine itself doesn't have a FQDN. > Therefore, I wonder if the sender's mail server was choking on that. > I've now added mail.onebigsite.com in the POST settings as the > default machine name for HELO. Previously it would HELO the receiving > machine simply as HOST17 (obviously not a FQDN).
