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Missing TLD

Printed From: LogSat Software
Category: Spam Filter ISP
Forum Name: Spam Filter ISP Support
Forum Description: General support for Spam Filter ISP
URL: https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=6290
Printed Date: 12 December 2025 at 10:19pm


Topic: Missing TLD
Posted By: StevenJohns
Subject: Missing TLD
Date Posted: 09 November 2007 at 6:46pm
Roberto,
 
I am running SF 3.5.4.718 and have noticed the following in the logs.
 
11/09/07 16:26:35:468 -- (8632) Connection from: 213.189.178.213  -  Originating country : Belgium
11/09/07 16:26:35:984 -- (8632) Received MAIL FROM: < mailto:linkage@norika-fujiwara.com - linkage@norika-fujiwara.com >
11/09/07 16:26:36:093 -- (8632) Received RCPT TO: mailto:mark@quantumwarrior.co.uk - mark@quantumwarrior.co.uk
11/09/07 16:26:36:390 -- (8632) - Invalid MX record - DNS Server Reports Query Server Error
11/09/07 16:26:36:390 -- (8632) Resolving 213.189.178.213 - host-213-189-178-213.brutele.be
11/09/07 16:26:36:390 -- (8632) 213.189.178.213 - Mail from: mailto:linkage@norika-fujiwara - linkage@norika-fujiwara . To: mailto:mark@quantumwarrior.co.uk - mark@quantumwarrior.co.uk will be spam-tagged
11/09/07 16:26:36:890 -- (8632) Starting queueing procedures
11/09/07 16:26:36:906 -- (8632) EMail from mailto:linkage@norika-fujiwara - linkage@norika-fujiwara . to mailto:mark@quantumwarrior.co.uk - mark@quantumwarrior.co.uk was queued. Size: 1 KB, 1024 bytes
11/09/07 16:26:36:906 -- (8228) Sending email from mailto:linkage@norika-fujiwara - linkage@norika-fujiwara . to mailto:mark@quantumwarrior.co.uk - mark@quantumwarrior.co.uk --
11/09/07 16:26:36:906 -- (8632) Starting bayesian procedures
11/09/07 16:26:36:937 -- (5080) Time to add Msg to Bayes corpus:16
11/09/07 16:26:37:062 -- (8632) Blacklist cache - Added 213.189.178.213 to limbo
11/09/07 16:26:37:202 -- (8228) EMail from mailto:linkage@norika-fujiwara - linkage@norika-fujiwara . to mailto:mark@quantumwarrior.co.uk - mark@quantumwarrior.co.uk --  was forwarded to 127.0.0.1:999
11/09/07 16:26:37:312 -- (8632) SFDB - Added 213.189.178.213 - Response: Error=0
11/09/07 16:26:37:312 -- (8632) Disconnect
 
As you can see, an email from mailto:linkage@norika-fujiwara.com - linkage@norika-fujiwara.com  arrives, gets spam tagged correctly and then forwarded to my internal email server for futher processing. However, when it forwards the email, it is missing the .com from the domain name.
 
I have checked the logs on the internal email server and they confirm that the .com is missing.
 
I have noticed that there is a space after the .com and before the > on the incomming email, has this got anything to do with it??
 
Cheers
 


Replies:
Posted By: LogSat
Date Posted: 10 November 2007 at 4:21pm
We were able to duplicate this behavior, and yes, it is caused by the space before the closing bracket. We're still going thru the RFC, but so far at first sight it seems that spaces are not allowed between the brackets "<" and ">". If this is confirmed, we are hesitant to modify SpamFilter to accommodate for this scenario, as we're concerned in potentially introducing unwanted bugs in the address verification process.

-------------
Roberto Franceschetti

http://www.logsat.com" rel="nofollow - LogSat Software

http://www.logsat.com/sfi-spam-filter.asp" rel="nofollow - Spam Filter ISP

Posted By: StevenJohns
Date Posted: 10 November 2007 at 4:36pm
My understanding of the RFC is that spaces are not allowed as you correctly pointed out.
 
>>> we are hesitant to modify SpamFilter to accommodate for this scenario, as we're concerned in potentially introducing unwanted bugs in the address verification process.
 
This is obviously already a bug in your address verification process as SF hasn't just dropped the space, its also dropped the com off the end. Look at the incomming email addresss, it is correct (albiet with a trailing space) but you are chopping off legitimate charicters.....what is your explanation for this??
 
 
 
I can't understand how you can  

Posted By: LogSat
Date Posted: 10 November 2007 at 5:04pm
When feeding non-RFC compliant data, there is no rule on how to behave... so "unexpected" behavior will occur. In this specific case, SpamFilter drops the space and the last suffix in the domain. This is because spaces are used as delimiters in the MAIL FROM command, and if the space appears where it's not supposed to be, strings will be truncated where they otherwise should not be.

-------------
Roberto Franceschetti

http://www.logsat.com" rel="nofollow - LogSat Software

http://www.logsat.com/sfi-spam-filter.asp" rel="nofollow - Spam Filter ISP

Posted By: StevenJohns
Date Posted: 10 November 2007 at 6:02pm
err, still don't understand why you drop the last suffix??? seems like a very strange thing to do.

Posted By: LogSat
Date Posted: 12 November 2007 at 8:34am
It's not strange at all. There are RFC rules that define where spaces should be. Dots, "@", spaces, and other characters MUST be placed in a certain way. Text is extracted by code that is built to behave as the RC dictates. If one of these characters is out of place, the code will simply not know, and will continue to extract text following the same rules. It will of course extract incorrect text, with completely unpredictable results. We don't "drop the last suffix"... it's the text parsing routines that were made to behave in a certain way that are "thrown off" due to the incorrect placement of one of the separation characters.

We really recommend you contact the sender (or the administrators of the sender's domain)  to inform them on the non-compliance issue.

-------------
Roberto Franceschetti

http://www.logsat.com" rel="nofollow - LogSat Software

http://www.logsat.com/sfi-spam-filter.asp" rel="nofollow - Spam Filter ISP


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