Hello

Exim Log

SMTP>> MAIL FROM:<>
SMTP<< 250 2.1.0 {mx023} ok
SMTP>> RCPT TO:<xxx>
SMTP<< 550 5.1.1 {mx023} <xxx>... User is unknown
SMTP>> QUIT

How can i setup exim, that this Mail will send back to sender ?
This Mail is 4d in my Exim Mail Queue

thx