Am 21.10.22 um 13:14 schrieb Amol Kulkarni:
Nginx has an mail proxy for pop, imap, smtp.
Can it be used instead of director ?


Nginx can authenticate imap/smtp (and probably pop3) users. If you that, you can define a backend server the session is routed to. Currently I use that approach to authenticate users by client certificates and route them to the appriopriate backend (well, I only have one ;-).
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Cheers
spi