You must uncheck "Refuse NULL <> Senders" in your SMTP config in order to be RFC-compliant.
The only "bug" in Imail is allowing you to refuse such mail! The default is to allow <>, which is good. -Sandy 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/ Please visit the Knowledge Base for answers to frequently asked questions: http://www.ipswitch.com/support/IMail/
