How to block e-mails with empty 'From:' feild?

[Keith Farmer]

Hi

Is there any way that I can block or delete at the server, e-mails that are
sent with the from field empty.

If someone can tell me how to write it in the filter I would really
appreciate it.

Thanks

Kaf

 

[johnf]

With Mailwasher Pro, I use the "[2] HTML Spam Tricks (B)" filter.
Under 'contains RegExpr' I set up two filters -

font size="?0"?
&
((<![\w\s,\.\-]+>)([\w\s,\.\-]){1,10}){3,}

HTH