Re: [cobalt-users] RE: ISP's and Port 25 blocks

["Ian" <cobalt@xxxxxxxxxxxxx>]

On 23 May 2003 at 10:44, Mike Smith wrote:

> >I use Portfwd (Search
> > the
> > archives, this has been discussed) with port 999 set to forward all
> > traffic to port 25.  That way my clients set their mail clients to
> > send
> > smtp over port 999 and then when it gets here to my server I move it
> > over to port 25.  It is a very elegant solution.  It does not open
> > any
> > security or spam issues either.  POP-before-smtp still works so only
> > legit users can use our smtp server.
> > 
> > This has made many clients of mine very happy.
> > 
> > ---------------
> > Michael Aronoff
> 
> Thanks, Michael - I was looking for a solution (which you provided),
> not what others suggested - "tell your clients to get another ISP".
> 
> Mike

Actually, you don't even need port forwarding.  You can get sendmail 
to listen on multiple ports.

Look in the sendmail config file ( /etc/mail/sendmail.cf )  for a 
line similar to this:

# SMTP daemon options


Then ADD a line like this:

O DaemonPortOptions=Port=999,Addr=<SERVER IP>, Name=MTA


Then restart sendmail.

Ian
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