Dovecot Active Directory Authentication

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Assumes working AD server

# cd /etc/dovecot
# cat >  dovecot-ldap.conf.ext << __EOF__
hosts = ad.domain.tld
ldap_version = 3
base = dc=domain,dc=tld
auth_bind_userdn = %u
auth_bind = yes
__EOF__

Add to /etc/dovecot.conf while commenting any other passdb and userdb settings
mail_location = maildir:~/Maildir/
passdb {
  driver = ldap
  args = /etc/dovecot/dovecot-ldap.conf.ext
}
userdb {
  driver = static
  args = uid=89 gid=89 home=/home/vpopmail/domains/%d/%n
}

# systemctl restart dovecot

Configure QMT Dovecot authorization