Dear all,

I do not know if it's a problem but i really want to fix this. I have postfix as a mail server and squirrelmail as the web client. I can add multiple identities from squirrelmail web interface which are not valid mail address so my users can add any address. Let's say the test@domain.com can add admin@domain.com as a sender address and send e-mails from this address without restriction.
Any help for this?

Thank you & Best Regards,