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I have an IMail 2006 server that is configured to restrict all
unauthenticated SMTP access (Deny all IP's except) except from the IP of
the machine running an antispam filter. For some reason, every couple
of days the IP of the allowed machine disappears from the list of IP's
that are allowed unauthenticated access. I'll put the IP back in and
it's fine for a day or two and then all of a sudden the IP is gone and
no one can send emails.
