Gavin Westwood said:
I only found out a few days ago that Gmail and Yahoo
(and possibly others)
will require senders to have SPF, DKIM and DMARC records (as well as
certain other criteria)
In practice, Yahoo have been 'we don't care how bad our users are at
sending spam, you need to obey these rules before we will give you a chance
of emailing them' for some years now.
Google have got pickier over the past couple of years.
I was completely unable to get Microsoft's services to accept email from a
server elsewhere, despite SPF, DKIM & DMARC. They'd accepted mail from it
at a previous IP address, but not from a new one with the same provider.
Nothing I tried would work: MS would just give me responses with out of
date broken links when I tried contacting them. In the end, I moved the
VPS.
If someone wants to have a class action over the behaviour of the big three
over this, I am in.
Ian
from February 2024:
https://postmarkapp.com/blog/2024-gmail-yahoo-email-requirements
I'm currently setting this up for a couple of my domains (it's already
working on a test sub-domain) to make sure I do it right, but thought that
I should drop a mail here for anyone else who isn't already aware.
Some useful links:
https://support.google.com/a/answer/81126
https://senders.yahooinc.com/best-practices/
https://www.linuxbabe.com/mail-server/setting-up-dkim-and-spf (Postfix
and DNS)
https://www.linuxbabe.com/mail-server/create-dmarc-record
https://www.exim.org/exim-html-current/doc/html/spec_html/ch-dkim_spf_srs_a…
Testing:
https://www.mail-tester.com
https://www.mail-tester.com/spf-dkim-check
Emailing check-auth(a)verifier.port25.com from the domain you are testing.
Thanks
Gavin
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