The GAUNTLET filter http://mailsbestfriend.com/downloads/Filters/GAUNTLET.txt filter has elements of what you are looking for, it includes some END exceptions.

This is the line which has to do with the sub-domain.

MAILFROM        0       PCRE    
(?i:@([a-z0-9-_]{5,25}\.[a-z0-9]+(?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?)

Hopefully this helps.

David


On 12/16/2014 4:24 PM, John Tolmachoff wrote:
Trying to catch when the from address is a sub-domain.

Another idea for another test: If a from address is a sub-domain, also check 
for MX records for the parent domain. In the spams I am seeing today where the 
from address is a sub-domain, and there is and MX record for the sub domain, 
there is no MX records for the parent domain.

-----Original Message-----
From: "David Barker" <[email protected]>
Sent: Tuesday, December 16, 2014 12:29pm
To: [email protected]
Subject: [MBF] Re: Need regex help

Not sure exactly what you are trying to match but according to what you
have provided:

(?i:@[0-9a-z]+\..+\..+)

Can you be more specific ?

David


On 12/16/2014 3:17 PM, John Tolmachoff wrote:
I am seeing an increase in spam and using an email in the format of 
[email protected].

I would like to find the right regex to use to look for 
*@(combinationnumbersletters).*.*

John T
eServices For You


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