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mail quarantine Reference user portal - Blocking clients

Hello,

We allow our users to release their quarantined mails via portal through (Email > Quarantine settings >  Release link settings) which is WAN link. 
We are getting some random failed  logins from a specified source, I know (Administration > Admin and user settings > Login security ) blocks the source ip after failed login attempts for a set period but,  Is there a way to block that source indefinitely ?  



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