[exim] Disable bounce messages on failed forward

Hi all,

At first I must apologize for my English.

I have issue with forwarding emails. Some users have setting forward
emails on external MTA, which verify SPF record. If sender's domain has
SPF record with the "-all" option, then the forward fail and my server
send bounce message on sender address.
This behaviour cause many complication, because the sender means, that
recipient don't receive the email.

I will implement the SRS technique in few weeks, but meanwhile I need
stop bounce message from forward. Have Exim4 such an ability?


Thank you for yours help.


PS: my Exim config is mostly built on Vexim configuration