From: Gavin Hamill <gdh@acentral.co.uk>
To: netfilter@lists.netfilter.org
Subject: Allow only SMTP 'callback'
Date: Mon, 10 Jan 2005 10:30:59 +0000 [thread overview]
Message-ID: <200501101030.59086.gdh@acentral.co.uk> (raw)
Hello :)
Normally I permit only port 80 incoming to our webservers, but since each
webserver also sends out booking-complete confirmation emails, I would like
to also enable incoming port 25 for those remote mail servers who 'call back'
to check that the envelope sender / HELO address is truly a reachable mail
server.
I don't particularly want to leave port 25 simply open, but only for those
hosts with whom an outgoing port 25 connection is already established with.
Is this possible?
Cheers,
Gavin.
next reply other threads:[~2005-01-10 10:30 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-01-10 10:30 Gavin Hamill [this message]
2005-01-10 11:18 ` Allow only SMTP 'callback' Sven Schuster
2005-01-10 11:55 ` Gavin Hamill
2005-01-10 11:34 ` Marc Haber
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