Have you been getting the following error in your log files?
Jan 7 14:10:30 [server] sendmail[2822]: sql_select option missing Jan 7 14:10:30 [server] sendmail[2822]: auxpropfunc error no mechanism available Jan 7 14:10:30 [server] sendmail: sendmail startup succeeded Jan 7 14:10:30 [server] sendmail: sm-client startup succeeded
The reason is that if the plug-in is installed, SASL tries to load and initialize all plug-ins that it finds. When the SQL plug-in is initialized, it needs a valid sql_engine (which defaults to ‘mysql’) and sql_select options.
So what is the solution? If you do not need the cyrus-sasl-sql rpm, then you can remove it like so:
[server][root][~]# rpm -e cyrus-sasl-sql
You could also do the following instead:
[server][root][~]# rm /usr/lib/sasl2/libsql.*