The Design and Implementation of laffer1

yum install cyrus-sasl-plain  is your friend.  THis fixes the mail vrfy blah blah error in the logs when you setup sendmail + saslauthd and you try to get thunderbird to auth properly. 

This bugged me for two days and there are hundreds of incorrect posts about using RELAY rules.  It's insane.

 did not issue MAIL/EXPN/VRFY/ETRN during connection to TLSMTA  fix is again to install the right cyrus sasl auth plugin from yum.