Re: [PATCH] ME's SMTP relay patch ported to CVS
On Wed, Sep 07, 2005 at 06:59:09PM +0200, Moritz Barsnick wrote:
> On Tue, Sep 06, 2005 at 15:48:50 -0700, Will Yardley wrote:
> > It's also commonly used by ISPs wishing to allow authenticated SMTP to
> > clients whose providers block port 25 outbound.
> ...until this port gets blocked as well. :-/
Well, as I indicated in my original message, the submission agent isn't
supposed to accept mail from non-authenticated clients. So blocking of
port 587 outbound is much less likely to happen.
ISPs generally block port 25 to prevent their residential customers from
sending spam (intentionally or as a zombie machine / open proxy)
directly to the receiving mail host for a domain. In general, I don't
think these organizations object to users sending authenticated mail
through an alternate provider.
w