What a mess. My domain used to be managed by domains.google.com, which got sold to Squarespace. I looked at my DNS records on Squarespace and I cannot find anything resembling normal DKIM records.
I do see a CNAME record for _domainconnect.domains.squarespace.com, which seems suspicious. I also see a CNAME record for *randomname* with the value *randomstring.* dv.googlehosted.com.
How any of this ever worked I do not know. I think it is time to move my domain to Cloudflare and set up DKIM from scratch.
On Thu, May 7, 2026 at 11:31 AM Thomas Krichel <krichel@openlib.org> wrote:
Stephen Daniel writes
550 5.7.9 This mail has been blocked because the sender is unauthenticated. Yahoo requires all senders to authenticate with either SPF or DKIM. Authentication results: DKIM = FAILURE - SPF XXX.org with ip X.Y.Z.W = SUCCESS. See https://senders.yahooinc.com/smtp-error-codes/#authentication-failures for more information. This has worked for a long time. What would suddenly cause DKIM failures?
I just saw the same thing with all my yahoo subscribers. Yahoo are the worst freemail provider I have come across.
I contacted all my yahoo subscribers. They gave me non-yahoo addresses.
-- Written by Thomas Krichel http://openlib.org/home/krichel on his 22252nd day.