break mail send out with non set local usesrs to stop local spam

[titoc...@gmail.com]

Hi.

I'm newbie on manage a postfix server. I have a mail server with postfix service and need know how block non set users. I think a script set on pickup daemon to check the header's mail_from email and compare against the database user, and discard mail if the email is not set in databases .

My server send spam because my users not do a correct mantenance of his web and his email's users have stole his password.


I suppose the pickup daemons do not have the same configuration with the smtpd dameon,and the filter script set to one to other not between block.

Regards.