Block spammer on firewall level

Hi, i'm running qmail on plesk. There were a lot of spams from different source spamming to non-existance user on my server.

Is there any script that could identify the spammer and automatically block it on the firewall level?Maybe the script could look like this:-

It will fetch the information from the maillog and block the IP which sends email to non-existence user of the particular domain. (bounce).
For now, the email will bounce but it will be a problem if there are too many bounces.

 

 

 

 

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