Hi!

> Something is not correct.
> 
> Dovecot 2.3 ports does work, but not the 2.4 ports

dovecot 2.4 is really not a simple upgrade. The config files need to
be changed in some manner.

> Here are errors I am seeing
[...]
> lain): Finished plain passdb verification (status=user-unknown)
> Aug 21 15:01:01 auth(dave,10.14.0.4,sasl:plain)<f5oT75RZzsYKDgAE>: Debug: 
> sasl(plain): Interaction failed

So your passdb lookup failed. Did you change anything in your configs
to adapt to the new syntax ?

https://doc.dovecot.org/2.4.0/installation/upgrade/2.3-to-2.4.html

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