I recently discovered that it is a known behavior for Marketo to report a false positive Send Alert activity if there is an invalid email address (missing '@' was my particular issue) on the 'To Other Emails' list for a Send Alert flow steps. Marketo shows the send just like any other in the Activity Log, but the email doesn't actually get processed properly on the backend and is never sent to the inbox of any of the cc'd emails. There aren't any details about the failure in the activity details. No system errors are logged either.
It would be great for there to be something that we can use to internally monitor these errors.
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