Re: SMTP and ports 25 and 1025.
> > On Sun, Mar 18, 2007 at 02:13:08PM +0100, Albert Dengg wrote:
> >> to my knowlege, port 587 is for _authenticated_ message transmission,
> >> e.g. from your own users, not for server<->server.
> Roberto C. Sánchez wrote in Article
> <[🔎] 20070318204008.GD16189@miami.connexer.com> posted to
> gmane.linux.debian.user:
> > Actually, 587 us the submission port. It has nothing to do with
> > authentication. Basically, the RFCs are written such that port 25 is
> > supposed to be use for the exchange of messages among mail servers and
> > port 587 is the port for users to introduce new messages to the system.
On 20.03.07 03:13, Paul Johnson wrote:
> I wonder how often this is actually done in practice however.
the submission - still more often, because outgoing SMTP connections from
dynamic addresses (and often even static) are being blocked by ISPs in an
attempt to stop spam spreading from them.
required authentication - i'd say the same.
Although it's of course possible to run unauthenticated submission for local
networks on port 587, I'd say that's very bad idea. Using authentication
gives benefits like better spam score to the senders, and easier
configuration to admins.
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