Hi there, We have a situation where Postfix installed with a single domain, serving a subnet of local LAN users and SASL authentication enforced in order to send emails.
Even though that we know that the actual sender can be found by checking full email headers, but one of our security requirements is that the "local" senders should not be able to use an arbitrary From: header to send emails, and the value of this header must be the same as MAIL FROM (or envelope) address. Is any solution around this with Postfix? Thank you so much.
