Matthew Byng-Maddick wrote:
> To: exim-users@???
> Subject: Re: [Exim] Using IMAP protocol to SEND email ??
>
> On Sat, Apr 24, 2004 at 11:18:34AM -0500, Edgar Lovecraft wrote:
> > Practically no one blocks TCP 587 (SMTP Submission), that port along
> > with SMTP-AUTH was designed just for this. Just set up exim to listen
> > on both port 25 and 587, and have all of your users set there smtp
> > port for outgoing email to 587. Why does no one use this?? Also, if
> > you find that users cannot get to tcp 587 then setup a third arbitrary
> > port 2525? that they should be able to get to. My point being, choose
> > an alternative port that your users use ALL the time so that they do
> > not have to change settings depending on where they are.
>
> In particular, it is important to make sure that you can't deliver
> arbitrary incoming mail on port 587, but that it can only be used for a
> mail transaction once some form of authentication has taken place, or
> spammers will just start using that, and we'll be back to where we
> started. :-/
Duh... That is what the standard is for ;)
Anyone who implements a very poor MSA setup deserves what they get.
For those that have not read the relevant RFC:
http://www.faqs.org/rfcs/rfc2476.html => Message Submission
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