On 10/10/2017 6:20 PM, paul@tokyoprogressive.org wrote:

Thank you, Mark. Had to resend this as I forgot to remove the quotes in the first attempt. Re it being a DMARC issue, all the options look bad (except telling people to use another email provider).

Which is exactly what I do with the dozen-ish lists that I host/admin. Friends don't let friends use Yahoo... :-(

-Chip-

On 10/10/2017 03:20 PM, paul@tokyoprogressive.org wrote:

OPTIONS A few are unclear, such as RESTARTING Mailman. How does one restart it? I use Cpanel and do not know the inner workings.

Which do you think it the best of the suggestions? I already have content filtering set to off to allow attachments. And there is currently only a footer that says:

If your cPanel is reasonably up to date, you have Mailman 2.1.23 or 2.1.14. This what you want is in the list admin UI on the Privacy options... -> Sender filters page set

dmarc_moderation_action = Munge From dmarc_quarantine_moderation_action = Yes

and if it exists

dmarc_none_moderation_action = No

These are the settings referred to in the last paragraph of item 1) at https://wiki.list.org/x/17891458 and described in more detal it the linked DMARC page at https://wiki.list.org/DEV/DMARC.

it says "List subscribers with email accounts on servers that perform DMARC checks, such as Gmail, Hotmail (Outlook.com http://outlook.com/), Comcast or Yahoo itself, will reject the original message and respond back to the list with automated DMARC error messages"……. making it seem that all of these providers are no-nos.

But later it says "So users of Gmail, Hotmail and other DMARC-enabled providers will not only fail to receive messages sent to the mailing list by Yahoo users, but will flood the list with bounce messages, risking to be bounced off the list themselves”.

This sentence seems to imply that it is YAHOO users who should switch. But the previous quote implies people with all of those providers should switch.

Can you give me your opinion. Is it Yahoo that is breaking mailing lists, or is it Yahoo, Gmail and Hotmail?

The issue is twofold. Mail which will be bounced is mail From: yahoo.com, aol.com and any other domain that publishes a DMARC policy of reject. Initially, the only freemail provider to do this was Yahoo, but AOL soon followed. Currently both Gmail and Hotmail and also Comcast publish DMARC p=none, so mail From: those domains should not be bounced for DMARC policy reasons, BUT all 5 of those ISPs and many others honor DMARC which means they will all reject mail that fails DMARC from Yahoo and AOL and any other domain that publishes DMARC p=reject.

So no, neither quote implies Gmail or Hotmail user's need to switch. It only says that those users won't receive unmitigated posts sent by Yahoo users. and that those ISP's and others will bounce the Yahoo mail.

-- Mark Sapiro mark@msapiro.net The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan