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Jeff,

... I set up the DKIM records as they show. ... Around the end of May
all emails from groups.io started bouncing. I can send to my groups,
but I do not get the message in my inbox. All message from any group
and from anyone bounce now.

DKIM is an authentication technology (digital signature), so I would expect that setting it up in your email provider would affect the messages you send TO Groups.io, not the messages you receive FROM Groups.io.

Where can I look to try and figure out why? I don't see anything
helpful in the logs. This is the only message I see and it is on
every message. "554 5.2.3 MailPolicy violation Error delivering to
mailboxes".

I presume you're seeing this in the "Email Delivery History" of the Subscription page (or in your Members record) in one of your groups? That's where bounce-related info goes. If somewhere else, please explain.

I talked to Zoho, and they recommended setting my DKIM to "quarantine"
instead of "temporary reject". I just did that. I also white listed
groups.io. I sent a test message and it didn't bounce this time.

Ah, so your provider has controls for the disposition of incoming messages based on those message's signature.

But "temporary reject" sounds like greylisting, which shouldn't have caused a complete failure, and in particular it should have been returned to Groups.io with a 4xy not a 554 code. 5xy are codes for a "permanent" error.

I am not a fan of white listing! Any suggestions or help on where to
look wold be appreciated.

Groups.io strips off the signature you supplied when you sent your message to the group, and applies its own signature to the messages it delivers to members. This is correct and necessary because Groups.io modifies the message content (adds footers, if nothing else), invalidating your original signature. But that shouldn't matter to ZoHo.

Given that all Groups.io messages are now bouncing perhaps they are objecting to the fact that the message says that the messages are "From" you (your email domain) or some other member, but is sent to them by Groups.io.

Do you find any exceptions? Do messages from people using Yahoo Mail or AOL, for example, get through? If so that would tend to confirm the idea that the problem is a conflict in the From versus the sender.

Whitelisting may be your only solution. The real answer is for Zoho to improve their inbound processing to properly allow for message that pass through email lists, even when those lists which preserve the original From field. It sounds like they've gone in a DMARC-like direction, if so they should go all the way, including ARC processing for mailing list messages.

Shal


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