If you happened to find or block on pam auth in 2.3.1 here a few Details.
I ran into the same when testing.

Exhaustive debugging led me to enough data to find [1] and from there
With this applied until upstream settles how they want to resolve it
eventually things work much better for me.

Hope that helps on your >=2.3.1 efforts.

[1]: https://bugzilla.redhat.com/show_bug.cgi?id=1564348
[2]: https://github.com/dovecot/core/pull/71

Christian Ehrhardt
Software Engineer, Ubuntu Server
Canonical Ltd

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