On 04/12/2024 11:48 am, Tim Harman wrote:
Hi,
I've noticed that in the last month I can't receive email from people
using Office 365 hosted email. So, quite a few people. This is what
appears in my mail.log (postfix 3.4.23)
Replying to myself - I stumbled on the fix just after I sent this.
The fix has been to disable TLS Session cache on my mailserver. While
this is required on my Debian 10 box, I don't know, I can leave the
session cache enabled on my Debian 12 box and it still works fine. And
everyone else was able to deliver mail just fine, but not Microsoft.
But for anyone else that encounters this, is using Postfix, and gets the
problem, this is the line I modified in my postfix main.cf:
smtpd_tls_session_cache_timeout = 604800
changed to
smtpd_tls_session_cache_timeout = 0
And now they deliver mail just fine!
Thanks, sorry for the noise.
Tim
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