Apple Mail Since upgrade to dovecot 2.3.x unable to connect

Gregory Heytings ghe at
Mon Aug 17 13:11:53 EEST 2020

> ssl_cert = </etc/ssl/letsencrypt/
> ssl_key = </etc/ssl/letsencrypt/
> ssl_ca = </etc/ssl/letsencrypt/

This is wrong, it should be:

ssl_cert = </etc/letsencrypt/live/
ssl_key = </etc/letsencrypt/live/

The address does not resolve.  There is a , but its certificate is for , which is 
wrong.  There is also a , whose certificate is also for , which is okay.

Yet another possibility (but it seems less likely given that an Apple Mail 
from 2016 is a reasonably recent mail client) is that it does not support 
recent enough SSL protocols, which were enforced by your server upgrade. 
See the entries for MinProtocol and CipherString in the openssl.cnf file 
on the server.


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