On Mon, 13 Mar 2017, Phillip Hallam-Baker wrote: Perhaps we should just recognize the fact that SMTP does not really
support mailing lists, ...
These complaints had nothing to do with lists or DMARC. They were about sending ordinary unauthenticated mail over IPv6. If they wanted to fix that problem, they could do so in 10 minutes by publishing an SPF record, with no other changes to the way their mail works.
I must say, my chosen hosting provider, who support IPv6 very well, make publishing an SPF record very easy. It’s just a click on the control panel.
I do think though that we could probably make it clearer somewhere ‘official’ what the issues are for people signing up to our lists, e.g. perhaps at https://www.ietf.org/list/. I had a quick look and couldn’t see anything obvious there.
Tim |