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"CommuniGate Pro Discussions" <CGatePro@mail.stalker.com> on February 3,
2010 at 8:44 AM -0500 wrote:
>Note that in both cases the reported errors are related to connection
>problems (the connection was explicitly reset by the remote peer, or it
>was dead for 5 minutes). This may indicate a problem with the network or
>an activity of some anti-virus or a like working on the SMTP level.
The problem was stemming from our Cisco ASA 5505 ESMTP inspection filter.
Evidently there is a known 998 byte default that has been causing
problems. Once I turned that inspection off, mail flowed like brand new
pipe, except for Yahoo which is not our fault.
I have been informed that because I disabled the ESMTP inspection, outside
people, if they knew how, could access the server via telnet on port 25
and possibly send mail through that. Is this true and if so, what might I
do to prevent or decrease the chances of an uninvited guest relaying
through my server.
Thanks for your time.
Paul
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