[Mailman-Users] Executive summary of DMARC issues

Gary Algier gaa at ulticom.com
Wed May 14 18:26:48 CEST 2014


I have been following the discussion of the DMARC issues and Mailman's 
attempts to live with it.  I was wondering if anyone has an "Executive 
Summary" of the DMARC issue in a general sense.

The information on the wiki talks about the impact on Mailman, but I need a 
generic explanation that can be presented to our CFO.  Our management wants to 
move our email from an in-house Exchange environment (with Mailman on the side 
for mailing lists) to a totally MS365 solution.  We have been told that 
everything we do with Mailman can be done with Exchange distribution lists, 
etc.  I know all the reasons this is really a poor statement, but distribution 
lists have the same DMARC problem.

I created a test distribution list here.  I created local contacts that 
forward to my personal gmail.com and icloud.com addresses.  I added these and 
my work address to the list.  Email from gmail and icloud works fine, however 
the author address ("From:") carries the original address. When I sent an 
email from my yahoo.com account, it was not delivered to gmail.  I never saw a 
bounce, though, so I don't know who, if anyone, gets notified.

I am hoping that I can make this issue plain at an executive level so we can 
get them to stay with a Mailman solution as we "go to the cloud".

Of course if someone says that the current MS365 implementation has addressed 
this, then that's a different (unfortunate) story.

Gary Algier, WB2FWZ            gaa at ulticom.com             +1 856 787 2758
Ulticom Inc., 1020 Briggs Rd, Mt. Laurel, NJ 08054     Fax:+1 856 866 2033

Nielsen's First Law of Computer Manuals:
     People don't read documentation voluntarily.

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