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 Nothing I tried would work: MS would just give me responses with out of date broken links when I tried contacting them.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_and_dmarc.html

Testing:

https://www.mail-tester.com

https://www.mail-tester.com/spf-dkim-check

Emailing check-auth@verifier.port25.com from the domain you are testing.

Thanks

Gavin

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