telnet to mail server from outside does not get 220, telnet from inside works

[brad davison]

> From: jeffrey at goldmark.org
> To: demonichandextensions at hotmail.com
> Date: Mon, 12 May 2008 09:55:42 -0500
> CC: freebsd-questions at freebsd.org
> Subject: Re: telnet to mail server from outside does not get 220,	telnet from inside works
> 
> On May 12, 2008, at 9:04 AM, brad davison wrote:
> 
> > 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.
> 
> Have you checked to see what your mail logs say about those connection  
> attempts?
> 
> Cheers,
> 
> -j
> 

The maillog only has the line like:
May 12 11:20:14 email sm-mta[66223]: m4CFKEuB066223: [69.245.x.x] did not issue MAIL/EXPN/VRFY/ETRN during connection to IPv4

which is the same thing i get when i do the telnet XXXX 25 from a machine that's on the same network (that gets the 220)

May 12 11:20:52 email sm-mta[66314]: m4CFKfiJ066314: [10.0.60.60] did not issue MAIL/EXPN/VRFY/ETRN during connection to IPv4

Is there something for the telnet daemon, or the sendmail daemon that restricts telnet access to just the subnet its on?  i.e 10.* network?



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