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Hi there, I try make to work my mail infrastructure, but i have problem with this. I tryed with NGINX but i can read mail from thunderbird, but i can't send. It's problem with authentication.

My second plan is use dovecot configure to proxy imap/pop3 dovecot proxy mysql. It's really nice, working like I expect, but what i really do with postfix?

I want authenticate my user in mx1 or mx2,
How i can do that? Configure postfix using sasl to dovecot? Or configure postfix to be relay?

I can connect from mx1 with telnet to for example port 110 and see mails. But with postfix have a lite problem. Mayby this is a solution Dovecot imapc proxy?

I have two imaps server with half/half users, this is difficult.

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If your dovecot is already configured to provide authentication, configure something like this for dovecot

auth_mechanisms = plain login
service auth {
  unix_listener /var/spool/postfix/private/auth {
    group = postfix
    mode = 0660
    user = postfix
  }
}

and make postfix use the socket

smtpd_sasl_path = private/auth

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