How about this one: I have Refuse NULL <> Senders checked, and Check valid sender checked and I still get this:
20020304 223346 127.0.0.1 SMTP (1472) >MAIL FROM:<> 20020304 223347 127.0.0.1 SMTP (1472) 250 null sender <> ok Please visit http://www.ipswitch.com/support/mailing-lists.html to be removed from this list. An Archive of this list is available at: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/
