[sdiy] Anti-spam features and the List From: header

Ben Stuyts ben at stuyts.nl
Sun Feb 24 23:24:58 CET 2019

Hi Dave,

> On 23 Feb 2019, at 03:13, David Moylan <dave at expeditionelectronics.com> wrote:
> I recall a little while ago a discussion about the From: headers.  I think it was here but could have been on Analog Heaven.  In any event, I've recently set up SPF, DKIM, and DMARC on my domain to help my mail make it through spam filters.  For those who don't know too much about email SPF is a DNS record that states what domains or IPs can send mail on behalf of the From domain (expeditionelectronics.com in my case).  DKIM is a way to encrypt certain headers to prevent spoofing, and DMARC sets up a mechanism for domains to report back to senders about mail that have passed or failed checks.
> I replied to a thread recently and got some DMARC notifications back that the mail failed both SPF and DMARC checks for some listers.  That makes sense since my original message is getting relayed by SDIY, so it won't come from a valid server or have the encrypted headers.
> Anyone else run into this?  I assume these technologies are going to increase in adoption over time so this might be something that needs to be addressed by the list more in the future.

DMARC/DKIM is indeed a known problem for the list software (Mailman V2.1.29) we’re running. (And for basically any other mailing list software.) See https://wiki.list.org/DEV/DMARC <https://wiki.list.org/DEV/DMARC> and https://wiki.list.org/DEV/DKIM <https://wiki.list.org/DEV/DKIM>. There is currently not a good solution available that will not inconvenience someone else. Munging the From address might be the way to go in the future. But it’s probably start discussions/problems like the previous ones about reply-to and html… However, if there are any DMARC/DKIM/Mailman specialists out there willing to give advice, please contact me off-list.

In the mean time, perhaps you could adjust your own DMARC/DKIM policy to not flatly reject non-compliant emails. As for SPF, I believe it is of little use nowadays because most spammers circumvent it anyway. (And therefor, spamfilters pay little to no attention to it.)

Best regards,

> Thanks.
> Dave
> -- 
> David Moylan
> Expedition Electronics
> sonic adventures!
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