Am 14.07.2016 um 14:26 schrieb Gordan Bobic:
and if it's only for security resons because dovecot makes the
authetication based on the dbmail database directly with the client
and until that was successful no single bit of a arbitary client
passes to dbmail

The fact that you are running a different IMAP daemon as a proxy
in front of it sounds pretty damning...

no it don't

* you can share the same auth for postfix submission instead
  mangle around with sasld and friends

* if you have had historical setups where users needed % instead
  of @ and don't want a support nightmare you need something
  like "auth_username_translation" from dovecot anyways

* if you consider setup a scalable infrastructure you would
  anyways put a proxy in front to have later easy options
  for split load on different backends like you are
  doing it with http

* if you grow and have to serve *really* high load you
  would anyways consider a proxy doing TLS offloading
  far away from the backend servers as you do it with http

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