I don't think Mailfrom can do it because parsing is limited.

In Message Sniffer I can code

@$+\_$+\.com

...which means any underscore bounded by any number of letters between an @ and a dotcom.

I want to research a bit more before pulling the trigger on this but it looks like a good rule.

I will also say that I don't remember seeing many (if any) of these in recent history so it might be much to do over very little.

_M

At 01:48 PM 1/20/2004, you wrote:
Hi Matt:
 
Mailfrom?  how?
 
emails can contain underscore.. we can not filter on the domain only.. or can we?
 
Kami


From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Matt
Sent: Tuesday, January 20, 2004 1:36 PM
To: [EMAIL PROTECTED]
Subject: Re: [Declude.JunkMail] Underscore in domain..

Kami,

That's not valid.  I've also seen some from <jsmith@> which I believe is invalid as well.

to my knowledge, domain names can only have a hyphen or alphanumeric characters.  I believe that they can't begin with a hyphen either.  They also can't be shorter than two characters except for x.com which slipped through their system (became PayPal several years ago).

Might be a good idea to update the MAILFROM test for these.

Matt



Kami Razvan wrote:
Hi;
 
Can a domain name have underscore in it?
 
If not then we should really be in a position not to accept email from domain names that are invalid...
 
A test that checks for such validity would be great considering we can NOT filter on the domain name alone.
 
Please_don'[EMAIL PROTECTED]
 
Kami
 
==========
X-IMAIL-SPAM-DNSBL: (SPAMCOP,51970536,127.0.0.2)
X-IMAIL-SPAM-DNSBL: (BLARS,51970536,127.1.0.1)
X-IMAIL-SPAM-VALHELO: (51970536)
X-RBL-Warning: HELOBOGUS: Domain see_below.com has no MX or A records [0301].
X-RBL-Warning: IPNOTINMX:
X-RBL-Warning: NOLEGITCONTENT: No content unique to legitimate E-mail detected.
X-RBL-Warning: MAILFROM: Domain see_below.com has no MX or A records [0301].
X-RBL-Warning: COUNTRY: Message failed COUNTRY test (line 189, weight 1)
X-RBL-Warning: FILTER-HEADER-XMAIL: Message failed FILTER-HEADER-XMAIL test (line 45, weight 20)
X-RBL-Warning: FILTER-SPAM-HTML: Message failed FILTER-SPAM-HTML test (line 193, weight 5)
X-Declude-Sender: Please_don'[EMAIL PROTECTED] [203.125.58.130]
X-Declude-Spoolname: D44b4031901e80924.SMD
X-Note: ==================================================================
X-Note: Spam Score: 58 [BLOCKED ON 20+ & DELETED ON 60+]
X-Note: Scan Time: 10:10:08 on 01/20/2004
X-Note: Spool File: D44b4031901e80924.SMD
X-Note: Server Name: see_below.com
X-Note: SMTP Sender: Please_don'[EMAIL PROTECTED]
X-Note: Reverse DNS & IP: bb-203-125-58-130.singnet.com.sg [203.125.58.130]
============


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