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MSUNAG  March 2007

MSUNAG March 2007

Subject:

Re: New spam-fighting technique for mail.msu.edu going to DDC mailing list

From:

"Russell J. Lahti" <[log in to unmask]>

Reply-To:

Russell J. Lahti

Date:

Mon, 5 Mar 2007 13:33:01 -0500

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (146 lines)

Ed,

I'm glad to see a more proactive approach to fighting spam,
quite a change from the way it was at MSU just a few years ago.
I very much agree that the benefits outweigh the side effects,
and hope all goes smoothly.

Regards,

-Russell


> -----Original Message-----
> From: MSU Network Administrators Group 
> [mailto:[log in to unmask]] On Behalf Of Edward R Kryda
> Sent: Monday, March 05, 2007 1:12 PM
> To: [log in to unmask]
> Subject: Re: [MSUNAG] New spam-fighting technique for 
> mail.msu.edu going to DDC mailing list
> 
> Thanks for the input Russell, 
> 
> The techbase page, 
> http://techbase.msu.edu/viewpathfinder.asp?id=7772, has been 
> updated to provide a clearer and more accurate response. The 
> particular question, now reads: 
> 
> "
> Will greylisting block valid email messages? 
> 
> Greylisting will eventually allow all mail servers that 
> follow internet 
> standards for resending messages to process normally. However, some 
> legitimate mail systems don't follow these standards. 
> Identified legitimate 
> sources of email can be added to an exception list.
> " 
> 
> Its true that some email services will have issues with 
> greylisting, and we 
> will be monitoring the system to try and help identify those 
> issues. The 
> Help Desk will also be working with our team to help users 
> that are having 
> email delivery issues. 
> 
> Work has been done to help identify some of the major servers 
> that will have 
> issues with greylisting, which have been added to our 
> exception list. Its 
> not a perfect solution, but its my belief that the benefits 
> outweigh the 
> minimal side effects. 
> 
>  -Ed 
> 
> Russell J. Lahti writes: 
> 
> > I can't tell you how many broken MTA's there are out there
> > that will not handle a TEMPFAIL correctly, and junk the mail
> > instead of queuing it for later delivery attempts.  While I
> > definitely don't have much sympathy for the people running
> > these non-RFC compliant systems, they definitely are out there,
> > and answering the question of: 
> > 
> > Will greylisting block valid email messages? 
> > 
> > With the response: 
> > 
> > No. Greylisting will eventually allow all valid mail servers
> > that resend messages to mail.msu.edu to process normally. 
> > 
> > is a slight bit misleading.  There is a definite chance that
> > what an end user might consider legitimate mail might be lost
> > by implementing greylisting.  While a vast majority will work
> > normally, some will likely not.  For example, web apps that
> > have been developed to emulate an SMTP conversation instead
> > of dumping the mail to an MTA queue for delivery, etc. 
> > 
> > I'd be interested in what others have run across in their
> > greylisting endeavors.  The few times that I have seen it
> > implemented I have also seen it removed. 
> > 
> > -Russell 
> > 
> > 
> >> -----Original Message-----
> >> From: MSU Network Administrators Group 
> >> [mailto:[log in to unmask]] On Behalf Of Edward R Kryda
> >> Sent: Friday, March 02, 2007 2:14 PM
> >> To: [log in to unmask]
> >> Subject: [MSUNAG] New spam-fighting technique for 
> >> mail.msu.edu going to DDC mailing list 
> >> 
> >> NAG has asked that we give a heads-up when we send mailings 
> >> related to computing at MSU to MSU's Deans, Directors, and 
> >> Chairs (DDC) list.
> >> The following mailing from Tom Davis, director of ACNS, will 
> >> go to DDC soon.  
> >> 
> >> Edward Kryda
> >> Email Team Leader
> >> mail.msu.edu  
> >> 
> >> ==============================================================
> >> =========
> >> To:  Deans, Directors, and Chairs
> >> Subject: New spam-fighting technique for mail.msu.edu  
> >> 
> >> Unsolicited commercial e-mail, or spam, annoys us all and 
> >> inhibits our productivity.  Industry experts estimate that at 
> >> least 80% of all Internet e-mail is now spam.  Mail.msu.edu 
> >> processes up to four million messages per day, blocking about 
> >> half as spam.  
> >> 
> >> To combat this problem, the ACNS mail team will add a new 
> >> feature to mail.msu.edu on March 7, a technique called 
> >> "greylisting."  Rather than attempting to identify spam based 
> >> on the content of the message, greylisting blocks spam based 
> >> on the behavior of the remote e-mail server.  
> >> 
> >> When first installed, greylisting will introduce a temporary 
> >> delay in the receipt of incoming e-mail (as it "learns" which 
> >> remote e-mail servers can be trusted).  Delays will be as 
> >> little as 5 minutes to as much as a few hours, depending on 
> >> the configuration of the sender's e-mail server.  These 
> >> delays will fade within a day or so.  
> >> 
> >> Greylisting is another tool to fight the scourge of spam. Our 
> >> existing spam techniques have strained our mail servers and 
> >> introduced e-mail delays due to the sheer volume of messages 
> >> being processed.  We expect the implementation of greylisting 
> >> to improve this situation.  
> >> 
> >> The ACNS mail team will carefully monitor the performance of 
> >> this new procedure.  If you note any problems or have 
> >> questions, contact the ACNS Help Desk at (517) 432-6200.  For 
> >> more information, please visit:
> >> http://techbase.msu.edu/viewpathfinder.asp?id=7772&service=help  
> >> 
> >> Tom Davis, Director
> >> Academic Computing and Network Services  
> >> 
> > 
>  
> 

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