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Pat,

They do not show up later, and they are not shown as bouncing.

In my opinion if they aren't being delivered (to either Inbox or Spam) and they are also not being rejected (bounced), then you have a cause of action against your email service. It is not in the least bit acceptable for them to simply drop your messages into a black hole.

But before making any rash allegations I'd have another look at the Email Delivery History tab of your Subscription page in an affected group (logged in with the affected address).

If The Most Recent Successful Delivery section reflects a recent message in the group, and you don't see it in your Inbox or Spam, then that's evidence that your email service accepted the message from Groups.io and then lost it. Or maybe evidence that you have a rogue filter in your email interface or some other issue with your setup (using POP from more than one client, without "leave on server" for example).

If that most recent success is not the most recent in your group, and you do have that one in your interface, then I would suspect a Message Selection setting other than "All Messages" in the Advanced section of your subscription. Or maybe you have Muted one or more topics or hashtags.

If there's an entry in the Most Recent Unsuccessful Attempt section that represents a message which was deferred (temporarily rejected) by your email service. That's evidence of greylisting. But such messages typically are delivered after some delay for retries.


Hope something in there strikes a chord with your observations.

Shal


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