Well I don't see any section devoted to Postfix, Sendmail or SMTP. So I hope this is the right section.

In logcheck, I'm getting repeated warnings:

Feb 14 15:02:05 hostname postfix/smtpd[21534]: sql_select option missing
Feb 14 15:02:05 hostname postfix/smtpd[21534]: auxpropfunc error no mechanism available
Feb 14 15:02:05 hostname postfix/smtpd[21534]: _sasl_plugin_load failed on sasl_auxprop_plug_init for plugin: sql

Any idea what this means?

Any idea how to fix it?

Thank you.