I fought with this for quite a while the other day after upgrading my
VPS from Debian 9 to 10.
It seems something must have changed with SSL handling at another
level (maybe something with a Postfix update?).
What I ended up with:
Network Setup:
SMTP Listen Port: 25
SMTP Destination: 125
SMTP Secure Listen Port: 465
SSL Destination: 1465
Second SMTP Listen Port: 587
Second SMTP Destination: 1587
Force SMTP AUTH on Second SMTP Listen Port: On
SSL/TLS:
How to Handle STARTTLS Request: do TLS
Disable SSL on listenports: 25
Force TLS to Proxy on this Ports: 587
Client Side:
Connections to port 465: SSL/TLS
Connections to port 587: STARTTLS
----- Message from "Ing. Lukáš Pečínka" <lukas.peci...@osu.cz> ---------
Date: Wed, 28 Jul 2021 12:10:46 +0200
From: "Ing. Lukáš Pečínka" <lukas.peci...@osu.cz>
Reply-To: For Users of ASSP <assp-user@lists.sourceforge.net>
Subject: [Assp-user] STARTTLS - connection randomly timeout (outlook
imap error)
To: assp-user@lists.sourceforge.net
Hello,
I have some problem. I started ASSP with STARTTLS. Some users have
problem with connection timeout (180s). Same with MS Outlook. Test
message never pass and never connect on server. If I switch assp to
TLS proxy everything works fine. After 2 days I don't know what to
do or what I did bad. Could someone help me? Thank you.
Is something to tweak? Some Timeout or connection rise/lower?
I tested starttls connection in terminal via openssl - everything is good.
Listen SMTP port 25
SMTP destination 125
SMTP secure listen port 465
SSL Destination 225
second SMTP listen port 587
TLS Do TLS
Thanks a lot
--
S pozdravem a přáním pěkného dne | Best regards
Lucas
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----- End message from "Ing. Lukáš Pečínka" <lukas.peci...@osu.cz> -----
--
Mark D Montgomery II
techi...@techiem2.net
https://www.techiem2.net (Blog)
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