[exim] debugging tls handshake failure

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Author: Julian Bradfield
Date:  
To: exim-users
Subject: [exim] debugging tls handshake failure
I should like to know what's happening here:

2022-11-21 21:10:42 TLS error on connection from r218.notifications.rbs.co.uk [130.248.154.218] (gnutls_handshake): A TLS fatal alert has been received.

However, I can't see how to get any more information. I've tried
setting
add_environment = GNUTLS_DEBUG_LEVEL=3
in the exim4 config file, but it doesn't appear to do anything.

Is there a way to get more information?


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