[Info-vax] inhibit email with From: <> from being sent

[Bob Eager]

On Thu, 29 Dec 2011 11:58:50 +0000, Phillip Helbig---undress to reply
wrote:

> In the log of my SMTP relay server, I occasionally see a record of
> emails sent from the adress "<>", i.e. with an empty From: header.  I
> suspect this is some sort of backscatter spam.  (In general, a
> combination of RBL and setting Symbiont-Checks-Deliverability: to FALSE
> has stopped most of my spam.)  Is there any way to prevent this from
> being sent?

No, it's a valid thing to do. Read RFC 5321, section 4.5.5 in particular.

It is not backscatter spam - in fact, it's almost the opposite.
-- 
Use the BIG mirror service in the UK:
 http://www.mirrorservice.org

*lightning protection* - a w_tom conductor