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Date: Mon, 12 May 2008 11:43:52 -0400
From: "Josh Carroll" <josh.carroll@gmail.com>
To: "brad davison" <demonichandextensions@hotmail.com>
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Cc: freebsd-questions@freebsd.org
Subject: Re: telnet to mail server from outside does not get 220,
	telnet from inside works
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On Mon, May 12, 2008 at 10:04 AM, brad davison
<demonichandextensions@hotmail.com> wrote:
>
>  Is there something I need to configure in telnetd or sendmail to allow 'outside' IP addresses to telnet to the mail server and get a 220 response?
>
>  When I 'telnet localhost 25' i get:
>
>  email# telnet localhost 25
>  Trying ::1...
>  Connected to localhost.xxxxxxxxx.com.
>  Escape character is '^]'.
>  220 email.xxxxxxxxx.com ESMTP Sendmail 8.13.8/8.13.8; Mon, 12 May 2008 10:01:39 -0400 (EDT)
>
>
>
>  But if I try the same thing from 'outside' the firewall I get:
>
>  %telnet email.xxxxxxxxxxxx.com 25
>  Trying 67.x.x.x...
>  Connected to email.xxxxxxxxxxx.com.
>  Escape character is '^]'.
>  Connection closed by foreign host.

That looks like TCP wrappers dropping the connection. Have you checked
/etc/hosts.{allow,deny}? man 5 hosts_access for details.

Josh