If its stating 550, then yes the email host that got the original email from you is telling you that the email account doesnt exist.
1. If that user doesnt have posts/threads & doesnt visit, delete their account.
2. If the user has post/threads & does visit, send them a PM & tell them to fix their email, as you run an out dated version, you dont have the notice system to popup a notice for a usergroup.
3. If they dont fix their account, simply disable all their notifications, remove their birthday if its set.
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