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Message from dyeja@missouri.edu

I’m just curious to see how many of you have enabled SPF filtering on your email systems?

 

We recently enabled this, and the result is that we have many support tickets from users who no longer receive mail from rejected senders. These senders are legitimate, however, they have “bad” SPF records.

 

We’re wondering how other institutions are handling this, and if SPF checking is really worth it.

 

If I’ve posted this on the wrong list, please let me know.

 

Thanks,

 

 

Jan S. Dye

Messaging Services

Division of Information Technology

University of Missouri

920 South College 

Columbia, MO  65211

Office: (573) 882-1042

 

Comments

Message from dyeja@missouri.edu

Sorry about the duplicate posts, everyone.

 

Jan Dye

Messaging Services

 

Message from jtodd@westernu.edu

We’re using it but we only tag the message as possible spam if SPF fails. SPF doesn’t work well with e-mail forwarding.

 

Jason Todd

Network Security Officer

Western University of Health Sciences

 

We implemented this a few years ago. It is integrated with our email filter and helped eliminate quite a noticeable amount of spam and spoofing. Rather than just rejecting all the email, known bad is rejected, and questionable has the subject modified with the status. This took some configuring in the filter. The business mail systems we work with most frequently had to have there IPs added to our SPF record. You may need to contact the senders who have bad SPF records to figure out what is going on. If they have had it setup for a while, then if you've set it up correctly, you wouldn't be the only one having trouble with them. It does take some work to get setup, but was well worth the effort for us. David Pirolo Warner Pacific College On Thu, 2012-02-09 at 17:16 +0000, Dye, Jan wrote: > I’m just curious to see how many of you have enabled SPF filtering on > your email systems? > > > > We recently enabled this, and the result is that we have many support > tickets from users who no longer receive mail from rejected senders. > These senders are legitimate, however, they have “bad” SPF records. > > > > We’re wondering how other institutions are handling this, and if SPF > checking is really worth it. > > > > If I’ve posted this on the wrong list, please let me know. > > > > Thanks, > > > > > > Jan S. Dye > > Messaging Services > > Division of Information Technology > > University of Missouri > > 920 South College > > Columbia, MO 65211 > > Office: (573) 882-1042 > > > >
Message from derek.diget+educause-security@wmich.edu

On Feb 9, 2012 at 17:16 -0000, Dye, Jan wrote: =>I'm just curious to see how many of you have enabled SPF filtering on =>your email systems? We quarantine on SPF "fail". (There is plans to SMTP reject.) =>We recently enabled this, and the result is that we have many support =>tickets from users who no longer receive mail from rejected senders. =>These senders are legitimate, however, they have "bad" SPF records. We did this a could of years ago. There have been a few issues. Mostly with students/faculty forwarding from their previous .edu. (We tell them to go fix the address they have in Facebook, banks, etc to be their @wmich.edu address.) Another top issue would be user's wanting to use one address (like previous broadband provider) with their new broadband provider's MSA. Once they get the "profile" set up in their MUA to use MSA-X for X address and MSA-Y for Y address, they are all set. =>We're wondering how other institutions are handling this, and if SPF =>checking is really worth it. It is just one more tool to use. For us, where we seem to see it help is for the first messages in phishing runs for NACHA.org, FDIC, IRS and other money phishing. Within a few minutes our anti-spam starts blocking them, but the SPF check catches the ones that get through it. =>If I've posted this on the wrong list, please let me know. Probably would also want to post to the Higher Education Email Administration list hosted at Notre Dame. Note, that SPF is currently being updated from Experimental to a Standards Track protocol by the SPFbis IETF working group. (It was just chartered last week.) -- *********************************************************************** Derek Diget Office of Information Technology Western Michigan University - Kalamazoo Michigan USA - www.wmich.edu/ ***********************************************************************
Message from john.ladwig@so.mnscu.edu

SPF and DKIM seem to be getting a refresh/update under dmarc.orc, complete with new Internet-draft: http://www.dmarc.org/draft-dmarc-base-00-01.html There's been a bunch of press releases last couple of weeks from the DMARC organization. -jml
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