Ok, so it is documented for others. If you are using dovecot sasl with postfix and are using Thunderbird in Windows (part of an AD domain) and using smtp kerberos authentication, make sure you have line_length_limit = 2176 in postfix's main.cf.
Thanks to Wietse for his help. Trever -- "The Master doesn't talk, he acts. When his work is done, the people say, 'Amazing: we did it, all by ourselves!'" -- Lao-tzu
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