[Mimedefang] $Sender Formatting for Global Variable Clarification

[Kevin A. McGrail]

I was checking the manpage for 100% clarification and despite checking, I 
wasn't certain if the $Sender in Global scope that is based on the Commands 
file always meets the ^<?person at place.com>?$ format.

Can anyone confirm if this is expected so that something like this in 
filter_end would be guaranteed to work?

if ($Sender =~ /^<?someone at somewhere.com>?$/) {
      $spamtest_enabled--;
    }

Regards,
KAM