On 30/10/2021 00:01, Dominik Vogt via Exim-users wrote:
Since the Devuan 3 to 4 upgrade, my Exim 4.94.2 installation has a
problem with TLS certificates.

The local exit is set up to relay outgoing mail that is sent by
user X to server B and all other outgoing mail to server A.  Both
servers require TLS for outgoing mail.  But exit does not use TLS
for server B and generates this log message:

   ... TLS session: (certificate verification failed): certificate
   invalid: delivering unencrypted to H=<server-b> [<ip-address>]
   (not in hosts_require_tls)

How can this be fixed or at least debugged?

Don't set tls_verify_hosts in the transport.

The defaults for it and tls_try_verify_hosts do what you
probably want.
--
Cheers,
  Jeremy

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