This document describes Postfix with the following SASL
Cyrus SASL version 1 (client and server).
Cyrus SASL version 2 (client and server).
Dovecot protocol version 1 (server only, Postfix version
2.3 and later)
Postfix version 2.3 introduces a plug-in mechanism that provides
support for multiple SASL implementations. To find out what
implementations are built into Postfix, use the following commands:
% postconf -a (SASL support in the SMTP server)
% postconf -A (SASL support in the SMTP+LMTP client)
Needless to say, these commands are not available in earlier