Is there a process in Eloqua where invalid email addresses are being marked as hard bounceback?

Summary:

Is there a process in Eloqua where invalid email addresses are being marked as hard bounceback?

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We are looking at 119K contacts being marked as unsub in our Eloqua instance between 10th MAy 2026 and 16th May 2026. This question is following the same analysis, as quite a few contacts are marked as 'invalid email address' hence I am trying to find a co relation between Invalid email address and hardbounce backs.

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