If you need to configure SMTP AUTH in Postfix you either have the choice to use Cyrus SASL or Dovecot. Cyrus SASL is useful especially on boundary filters, where you don't want to install Dovecot "just to get authentication".
But Cyrus SASL is a little underdocumented... Long ago I began to write man pages for Cyrus SASL. During the recent x-mas holidays I finally found time to finish them and put them online. I hope they will be useful. Here's the page that links to all man pages: https://sys4.de/de/blog/2015/01/07/missing-cyrus-sasl-man-pages/ p@rick -- [*] sys4 AG https://sys4.de, +49 (89) 30 90 46 64 Franziskanerstraße 15, 81669 München Sitz der Gesellschaft: München, Amtsgericht München: HRB 199263 Vorstand: Patrick Ben Koetter, Marc Schiffbauer Aufsichtsratsvorsitzender: Florian Kirstein