dovecot - Aug 2013 - Dovecot and Postfix Authentication

I am a student and am trying to get a mail server setup for a project. I
have all of the Postfix configuration taken care of, but I am confused by
the way that authentication works with Dovecot in the mix. As a user of the
system, am I supposed to authenticate myself to Postfix, Dovecot, both
individually, or both together? My Postfix users are stored in a PostgreSQL
database, should Dovecot also be connected to this db? Some basic pointers
on how this setup ought to look is all that I'm hoping for.

Thank you,
Christopher

On 30 Aug 2013, at 20:37 , Christopher Trom <chtrom at gmail.com>
wrote:
> As a user of the
> system, am I supposed to authenticate myself to Postfix,
No. Postfix has no authentication methods on its own.

<http://www.postfix.org/SASL_README.html>
> Dovecot, both
> individually, or both together? My Postfix users are stored in a PostgreSQL
> database, should Dovecot also be connected to this db?
Yes.
> Some basic pointers
> on how this setup ought to look is all that I'm hoping for.
# Certs
ssl_cert = </etc/ssl/certs/dovecot.pem
ssl_key = </etc/ssl/private/dovecot.pem

# Dovecot 2.x
# For postfix to talk to:

service auth {
  unix_listener /var/spool/postfix/private/auth {
    mode = 0666
  }
}

# allow IMAP only
protocols = imap

# For IMAP users to get their mail

service imap-login {
  inet_listener imaps {
    port = 993
    ssl = yes
  }
}

# For SQL users to authenticate
# Note that UID and GID and mail_location are for MY system
# if all your users are in sql, you can get mail_location from
# the database

userdb {
  args = /etc/dovecot/dovecot-sql.conf.ext
  default_fields = uid=vpopmail gid=vchkpw mail_location=/usr/local/virtual/%u
  driver = sql
}



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