Subject: How can you block empty email address at sendmail?
To: None <firstname.lastname@example.org>
From: John Maier <email@example.com>
Date: 01/08/2001 11:35:21
I have been locking down my email and I seem to have one last spam hole.
The spammers send:
and the sendmail thinks the mail is from postmaster.
So how do I create a rule to tell sendmail to disallow blank 'from' emails?
I thought I saw an option at www.sendmail.org to disallow blank email
address, but I can't find it now.