On 06/16/2018 05:50 AM, Richard via CentOS wrote: > >> Date: Saturday, June 16, 2018 05:25:05 -0500 >> From: Johnny Hughes via CentOS <centos@xxxxxxxxxx> >> >> On 06/15/2018 05:18 PM, Richard wrote: >>> >>> >>> I believe this is a DMARC issue. Yahoo, among other places, has set >>> their dmarc records to p=reject: >>> >>> dig +short txt _dmarc.yahoo.com >>> "v=DMARC1; p=reject; pct=100; rua=mailto:dmarc_y_rua@xxxxxxxxx;"; >>> >>> So, if your mail hosting provider enforces dmarc,(gmail does) and >>> you get mail from a list that doesn't rewrite the headers, and >>> people from places like yahoo post to the list, you'll likely get >>> some form of warning about being being kicked off the mailing list >>> every now and then. The frequency depends on how often people from >>> p=reject places post, and what the settings are for bounce >>> handling of the mailing list in question. >>> >>> I believe that the current version of mailman can be configured to >>> do the necessary header rewrites. Some lists I'm on only do the >>> rewrites for headers of posts coming from p=reject sites (much >>> less annoying than having them all rewritten). >> >> This is indeed what happened. An email from yahoo.com.uk caused >> gmail to reject all the mails sent by that user because of the >> yahoo DMARC settings. >> >> We have now set the mailing list to rewrite headers. That also has >> set the From: of the email to the Mailing list and not the Original >> Author. The author is moved to the CC: block and you can still >> easily see who sent it and my email client (thunderbird) still does >> things the same way (reply to list sends to the list, reply sends >> to the original author). >> >> This should prevent the yahoo/gmail (or other dmarc) issues from >> happening again. >> >> For others running mailings lists on CentOS with this issue, Red >> Hat has back ported the 'dmarc_moderation_action' into the current >> version of mailman that is used in RHEL and CentOS. You can follow >> the instructions here for Mailman 2 (for version 2.1.18) even >> though the version in CentOS is mailman-2.1.15-26.el7_4.1 >> >> we will be watching the list for the next few days to see if this >> change is working as expected. If it id not working for other >> email clients please let us know. >> >> Great job by Brian Stinson to figure all this out :) >> >> Thanks, >> Johnny Hughes >> > > Thank you - one less list I'll get kicked off of regularly. > > One note, I am seeing the author in the Reply-To: in the message > headers, not in the visible Cc: as you indicate: > > From: Johnny Hughes via CentOS <centos@xxxxxxxxxx> > Reply-To: Johnny Hughes <johnny@xxxxxxxxxx>, > CentOS mailing list <centos@xxxxxxxxxx> > > so to see the address of the sender I have to either poke through the > headers or initiate a reply. I don't think that this is email client > specific. RIGHT ! .. I am showing that in Thunderbird for my emails (instead of CC on the lists :D). So I thought it was CC. So in thunderbird, you should see reply to (at least I do) when viewing the mail. For other email clients, not sure what is seen.
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