Hi everybody,

>>> I’m very interested in what options / solutions (if any) exist that allow
>>> you to use a passwordless approach to authenticating your users against
>>> imaps/pop3/smtps/submission services (tls encrypted of course)

one way to authenticate may be using Kerberos. Get your
K5-Ticket-Granting-Ticket at your Kerberos server,
yes: using username password, and then use this ticket
during the next hours to authenticate against properly
configured servers (Dovecot, Apache, ...). May be this
is a hint into the direction of what might help you.

Cheers, Dirk.

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