To block extra before authent user pass for deleted emailuser account possible?

ikkeben

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Joined
May 22, 2014
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Location
Netherlands Germany
So example:
one compromized user emailaccount, a Bot /hacker is trying to abuse with spam and virusmails to other mails from many/many different IP's.

Deleted that Usermail account.

Ofcourse stil the BOT/HAck is trying to login and more as server log files and so on as that deleted user so every few seconds, going on for day's now the ips are then blocked after x times, but then new ip and going on.

Is there a possibilty to block on that username before check password and auth?

With CSf of else?

Makes that sense for the performance?

Instead of this check
535 Incorrect authentication data (set_id=
 
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