How to switch between different SASL authentication services in UCS
The UCS postfix must authenticate the user if he wants to send an email. There are two SASL possibilities within UCS. On the one hand the stand-alone saslauthd, alternatively the sasl authentication integrated in Dovecot. This is controlled by the UCS variable.
Switch to standalone saslauthd
ucr set mail/postfix/dovecot_sasl=no
Switch to sasl authentication service from dovecot
ucr set mail/postfix/dovecot_sasl=yes
There are no special differences between these two services, only Dovecot wants the domain part as username. So ‘email@example.com’, whereas the saslauthd is satisfied with only the username. Only if you use more than one email domain, there might be some differences in these two services.