[NeXus-committee] Mailing list change to avoid DMARC/DKIM/SPF issues

[Freddie Akeroyd - UKRI STFC]

Dear NeXus Committee,

Many sites are now implementing DMARC/DKIM/SPF checking of incoming email, this can cause issues for mailing lists as they forward mail on behalf of a user. A receiving site would see the original sender domain in the "From", but also see that is was not delivered by a trusted source for that domain and may then discard or reject the email.

The mailman mailing list software has a "Munge From" option, this replaces the poster's address in the From: header with the list's posting address and adds the poster's address to the addresses in the original Reply-To: header. The original sender name is mentioned in some way like "NeXus on behalf of Freddie Akeroyd" but the message now looks like it has come from the mailing list server and so avoids issues at the receiver if they implement any DMARC policy of the original sender domain.

The only potential consequence of this action is that the default behaviour of "reply" may change in some email clients, but I am already aware of sites starting to trial DMARC/DKIM/SPF  so I believe it is a change we will need to make. I have now enabled this option for the nexus-committee list and if all looks to be well I will also enable it for the general NeXus mailing list

Regards,

Freddie

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