Validating Email addresses

Paul Lemmons paul.lemmons at
Mon May 11 21:03:17 IST 2009

-------- Original Message  --------
Subject: Validating Email addresses
From: Julian Field <MailScanner at>
To: MailScanner discussion <mailscanner at>
Date: 05/06/2009 01:57 AM
> On 05/05/2009 18:55, Paul Lemmons wrote:
>> We are getting a great deal of Spam bypassing both Postini and Mail 
>> Scanner due to a discrepancy between how these two products define an 
>> email address and the way Exchange does. The two scanning products 
>> recognize emails with a pipe character "|" at the beginning of the 
>> address as both valid and part of the email address. I believe this is 
>> in line with the email standards. Exchange, othe the other hand simply 
>> ignores the character. So a message sent to me at and 
>> |me at are seen as two different addresses by the scanning 
>> systems and as a single address by Exchange.
> Set "Reject Messages" to point to a ruleset, and have a ruleset that 
> looks roughly like this:
> FromOrTo: /^\|/ yes
> FromOrTo: default no
> and MailScanner will reject messages coming from or going to an address 
> starting with a pipe character.
> Simple as that.
> Remember to "service MailScanner reload" after changing the ruleset and 
> MailScanner.conf file.
> Jules
I have tried this and now I am getting a new message in my log....

MailScanner[5583]: Cannot match against destination IP address when 
resolving configuration option "rejectmessage"

# cat reject-messages.conf
FromOrTo: /^\|/ yes
FromOrTo: default no

Any thoughts?
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