[Mimedefang] what is the equivalent of $LOGNAME

[Xiaoyan Ma]

When running SpamAssassin through procmail  we quarantine messages  sent to 
$LOGNAME (users with a login name) with score above 12 and those sent to 
others, such as alias and mailing lists with a score above 10.  I would 
like to keep that when transferring  to mimedefang.

What will be the equivalent for $LOGNAME ? I do hope I don't have to dig 
into sendmail rulesets.

Xiaoyan