Re: [Exim] How to mark authenticated senders in the header?

I believe that RFC822 meant that the software inserting the originator
should ensure that somewhere in the header there is an authenticated
address.

The FROM header is a user field and can have multiple recipients so may or
may not be authentic. The system should check this and, if not, stamp
the message with a SENDER field. The FROM header is a user or system field
whereas the SENDER header is for system use only.

Error message are sent to the SENDER and if none the From address.
Replies should be sent to the REPY-TO or the FROM address.

However is practice this does not happen and so the mess continues. I
suppose this is why EXIM has sender_verify etc.

John Linn