[vchkpw] How can I do user verify

[Yavuz Maslak]

Hello   I use netqmail1.05 with vpopmail. I want mail server to check users to incoming mails. if delivered-to email-adress is not valid  mail server should not accept it. in addition if spammer sends too many random mailaddresses towards my mailserver, it should block sender ip address.   Does anyone know a script/patch  about that ?   Thanks for your advice.