# $reply_address
exim -odi CALLER
From: CALLER

From set, reply-to non-existent.
****
exim -odi CALLER
From: CALLER
Reply-to:

From set, reply-to empty
****
exim -odi CALLER
From: CALLER
Reply-to: usery

From set, reply-to set
****
exim -odi CALLER
From:

From empty, reply-to non-existent
****