cazwp

After doing a little digging, I found a few reasons why this could happen. This article helps explain about a dozen possible causes.

Within other SMTP plugins there are similar questions being asked so this is a common-ish issue from what I can find.

I’m pretty sure our issue was in the original email holder changing their global google password.

I will follow up in a week or two after I’ve run this a bit longer and can validate that is what happened.