[Dovecot] Log successful login plain text password

[Marco Fretz]

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Hi everyone,

I want to use dovecot as a IMAP and POP3 proxy in front of our current
E-Mail hosting server to log the plain text passwords of all successful
logins for migration reasons. Actually I don't need the password to see
in plain text, storing them as SHA256-CRYPT (or something dovecot can
use later for auth) hash in a file or DB would be fine, too.

I need this for the migration from the current mail server (using
proprietary hashing to store passwords) to a new postfix / dovecot base
mail system.

I played around with "auth_debug_passwords" and all debug / logging
options I found in the manual. Nothing logs successful login plaintext
passwords.

Any hint welcome.

Thanks a lot,
Marco

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