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From: Mick <michaelkintzios@gmail.com>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] Technical imap mail question
Date: Thu, 15 Oct 2015 23:01:16 +0100
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On Thursday 15 Oct 2015 18:04:22 walt wrote:
> My ISP recently started offering imap email service in addition to
> the pop3/smtp servers they've always had, so I decided to try it.
>=20
> I was surprised to see that they recommend using a different smtp
> server name when setting up my mail client, and they even offer the
> option of using port 587 instead of 465 if I prefer it.
>=20
> Why would I use a different smtp server if I'm now using imap? I use
> smtp to send mail, and imap to read it, right? Why not use the same
> smtp server in either case?
>=20
> (The different server names actually resolve to the same IP address, so
> the distinction seems to be more theoretical than real, but the theory
> is what puzzles me.)
>=20
> Thanks.
Port 587 is for TLS and is the proper port to be used by MSAs as per RFC640=
9.
Port 467 on the other hand is for SMTPS: vanilla SMTP at the application=20
level, but the communication to the server is still secured at the transpor=
t=20
layer with SSL. This was an IANA attempt to provide a port for secure emai=
l=20
communication pre-STARTTLS days. Today I think may be used for other=20
purposes, but I am not sure if it is TCP or UDP streaming.
Port 25 (outgoing) is blocked by most domestic ISPs to guard against the=20
millions of pawned botnets out there filling out inboxes with spam.
The question about a different SMTP server might have something to do with=
=20
your ISP adding a new SMTP mailserver to their farm and configuring it=20
properly this time as per RFC6409. Although as Alan said, they probably=20
rolled out whatever the chosen ISP package software vendor provided for the=
m=20
without knowing much about it, or why it is configured the way it is=20
configured.
=2D-=20
Regards,
Mick
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