Hi All, ICloud started deferring a lot of Groups.io email this afternoon, so I contacted their postmaster address. They responded promptly. I am just a simple unfrozen caveman lawyer, and I'm not sure I understand what's going on. I'm hoping someone might be able to help (Groups.io is an email group hosting service, similar to Google Groups).
The relevant part of their response is as follows: Can you please have your email administrators check your SPF / DKIM > settings and ensure that mail sent from your domain has valid DMARC > signatures in accordance with the DMARC policies that you have defined for > your domain. > As you can see we are not able to validate your SPF and DKIM records: > > < Dkim :dkim=fail reason="signature verification failed" (2048-bit key) > header.d=groups.io header.i=@groups.io header.b=Y9CUx0w1> > > SPf:timestamp="May 16 23:14:05" lvl="5" thread="2612246/1" > uuid="caa009c7-e0a1-4d83-a0da-97716659a01f" Insert header > <Authentication-Results: spf.icloud.com; spf=none (spf.icloud.com: > SRS0=b6ba=mt=groups.io=bounce+redac...@siark.com does not designate > permitted sender hosts) smtp.mailfrom="SRS0=b6ba=mt=groups.io= > bounce+redac...@siark.com">> We did in fact send an email group message, at this time, to someone at @ siark.com, with the "bounce+REDACTED" envelope from, except that our envelope from was from groups.io and didn't have the "SRS0=b4ba=mt=groups.io=" prefix. The message was sent to the group from a msn.com address. For group messages, we replace any incoming DKIM header with our own. For this particular email, we kept the original From line, originating from @msn.com, because msn.com's DMARC record is p=none. The siark.com recipient has been a member of this group since 2020. Does the above mean that the message we sent was forwarded on from siark.com to an iCloud address? If that's true, the envelope from and the message from are domains other than groups.io, so why would they associate any authentication failures to us (and start deferring email from us)? Just from the DKIM header? Thanks, Mark
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