On 11/15/2010 08:43 PM, Tony White wrote:
Hello,
Is there a way of verifying the From address that claims to be from one
of the domains
hosted here is a valid email address? There has been an increase of spam
using one or
more the domains hosted on my servers.
I am still searching the web but no searches found yet!


The best way I've found to block these is by blacklisting your local domain(s) with spamdyke.
http://wiki.qmailtoaster.com/index.php/Prevent_Spam_from_valid_sender/recipient

--
-Eric 'shubes'


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