Disabling sender spoofing localy in postfix
 

Hi all,

I want to disable sender spoofing for all users even if they are not relaying, i.e. even if they are sending local mails. I want postfix to check the MAIL FROM address, if there is an email equivalent for it in ldap, then the query is successfully made. If not then the message is not sent...

Thanks Alot

Take a look at reject_unlisted_sender under in the postconf(5) man page.