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1.4. Configuring SASL
Postfix supports two SASL implementations Cyrus SASL and Dovecot SASL. To enable Dovecot SASL the dovecot-core package will need to be installed. From a terminal prompt enter the following:
sudo apt install dovecot-core
Next you will need to edit /etc/dovecot/conf.d/10-master.conf. Change the following:
service auth {
# auth_socket_path points to this userdb socket by default. It's typically
# used by dovecot-lda, doveadm, possibly imap process, etc. Its default
# permissions make it readable only by root, but you may need to relax these
# permissions. Users that have access to this socket are able to get a list
# of all usernames and get results of everyone's userdb lookups. unix_listener auth-userdb {
#mode = 0600
#user =
#group =
}
# Postfix smtp-auth
unix_listener /var/spool/postfix/private/auth { mode = 0660
user = postfix group = postfix
}
In order to let Outlook clients use SMTP-AUTH, in the authentication mechanisms section of /etc/dovecot/ conf.d/10-auth.conf change this line:
auth_mechanisms = plain
To this:
auth_mechanisms = plain login
Once you have Dovecot configured restart it with:
1 http://www.ietf.org/rfc/rfc2554.txt
2 http://www.ietf.org/rfc/rfc2222.txt
sudo systemctl restart dovecot.service