Fresh Install ISPConfig on Centos 7.3 - Broken Postfix and Dovecot

Hello all

My installation was based on the tutorial for Centos 7.2 here

I noticed that Postfix while it starts, telneting to port 25, it is accessible, but SMTP Banner is missing. Also logs at /var/log/maillog shows error "SASL: Connect to private/auth failed: No such file or directory" by postfix.

I fix this by following the instructions by easyorange in the comment section here -

chown postfixostfix /var/spool/postfix/private/auth
chmod 666 /var/spool/postfix/private/auth

edit - /etc/dovecot/conf.d/10-master.conf and set it as below -
unix_listener auth-userdb {
mode = 0666
user = postfix
group = postfix
}

# Postfix smtp-auth
unix_listener /var/spool/postfix/private/auth {
mode = 0666
}

Restart dovecot for effect -
/etc/init.d/dovecot restart

While the above fixes SMTP service, dovecot IMAP and I assume POP# as well is also broken (I am testing IMAP only at that time)

I am having this issue - After creating a mailbox user, I am unable to access the mailbox in question. The username was correct - full email address - and no typos in the password.

I enabled the debug logging for dovecot in /etc/dovecot/conf.d/10-logging.conf, specifically auth_debug and mail_debug. What I noticed is that there's a lack of logs showing doveot accessing the dbispconfig in the mysql db. Not even a sql query but the error message was Unknown User.

dovecot -n shows userdb's driver as passwd and passdb's driver as pam. Other resources mentions dovecot accessing the mysql db directly.

Anyway, I fix it by modifying th file /etc/dovecot/conf.d/auth-sql.conf.ext
passdb {
driver = sql
args = /etc/dovecot/dovecot-sql.conf.ext
}
userdb {
driver = sql
args = /etc/dovecot/dovecot-sql.conf.ext
}

A restart dovecot to refresh its config, Roundcube mail works now..