Dan,
I have a user complaint about not getting messages, this is a
screenshot of the record. Any advice on what this means, and how to
troubleshoot?
What Duane said.
Basically this is a problem which the member's email service. Have the member send your screenshot to tech support at his/her service. The user can also locate the same information on his/her Subscription page or via his/her Account, Recent Bounces page; if the member has any other group subscriptions bounces from all of them would be listed there.
Until and unless he/she can convince his/her email service to whitelist Groups.io, or at least ignore this particular Real Time Blacklist service, the member is likely to have ongoing problems with missing messages.
My impertinent advice: choose a better email service.
The wiki page about "removed for spam" is tangentially related, but this particular member's problem isn't that group messages went to spam, it is that they were rejected outright by his/her email service.
If the group's messages /had/ gone to spam that would have been better: at least the member could find them and mark them as "not spam".
Shal
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