OK, the list *really* needs to be fixed

[Bob Sneidar]

Fair enough, except that list servers are supposed to be configured in such a way so as to get around this. A list server *should* send a separate email to each user in a list, NOT one email to ALL the users in the list. The latter will definitely get "DMARC'd" as spam, especially if the addresses are not in the BCC field. Also, the list server *should* send the emails in a throttled way, so as not to raise any flags. 

It may be that gmail has tightened their DMARC rules, and so an adjustment needs to be made in the list server to accomodate them. If this cannot be done, it might be advisable to use a different domain. Mail issues like this are definitely a nuisance, but in the modern age where email accounts are getting compromised, providers are understandably a bit skittish. 

Bob S


> On Jan 3, 2017, at 09:08 , J. Landman Gay <jacque at hyperactivesw.com> wrote:
> 
> Found this explanation:
> https://mail.python.org/pipermail/mailman-users/2015-December/080211.html
> 
> It includes this:
> 
> Let us say you have 5 users on your list, user1 at aol.com, user2 at aol.com, user3 at aol.com user4 at aol.com and user5 at aol.com. user1 at aol.com posts a piece of mail to your list. mailman tries to deliver to user2, user3, user4 and user5 @ aol.com aol says "drop dead, we don't talk to you because of our DMARC policy" mail to user2 user3 user4 and user5 bounces. Their bounce count is incremented.
> 
> user2 at aol.com posts a piece of mail to your list. mailman tries to deliver to user1, user3, user4 and user5 @ aol.com aol says "drop dead, we don't talk to you because of our DMARC policy" mail to user1 user3 user4 and user5 bounces. Their bounce count is incremented. and so on. Every time somebody from aol sends mail to the list, it bounces for every other aol member on your list. Their bounce counts increase.
> 
> One day, some message sends some of the bounce counts over the limit mailman has, after which it says -- Too many bounces! I cannot deliver mail to this account! Unsubscribe this person! And, because of the way things have happened you get a triggering message which causes a lot of unsubscribes _from the same site_.
> 
> Jacqueline Landman Gay         |     jacque at hyperactivesw.com
> HyperActive Software           |     http://www.hyperactivesw.com
> 
> 
> 
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