Hello, Assuming that I had enabled SASL mechanism. Can I use a mysql: something list (probably a custom query probing the user table for "1" in a particular column) to restrict the access to SMTP relay to a very few users?
eg. smtpd_sender_login_maps = mysql:/server/etc/postfix/allowrelay.sql with allowrelay.sql something like that? hosts = unix:/var/lib/mysql/mysql.sock user = someuser password = somepassword dbname = mail_postfix query = SELECT `address` FROM `mailbox` WHERE `address` = '%s' AND `relay` = '1'; Is this going to do the trick?