[exim] Discard bounce notification emails before they are se…

I have not had any luck in solving this problem, which really should not be
as complicated as it has been.

I need my email server to discard all bounce notification emails as opposed
to attempting to deliver them to their original senders.

My server wastes a HELL OF A LOT of resources attempting to deliver bounce
notifications to email addresses that are not real. 90% of the bounce
notifications my server has tried sending have resulted in hard bounces to
the original sender. At times my queue runners are doing nothing but wading
through these useless emails while important emails wait.

I have been told and warned by many people as to the disadvantages of not
sending bounce notifications, but these warnings do not apply in my case,
since I am tracking bounces myself in a db--and at any rate there shouldn't
be anyone using this server for business of personal or private email, so if
anyone is in fact misusing my server, I would prefer not to extend them the
courtesy of telling them that I was unable to deliver their mail...

I have read in the documentation (perhaps incorrectly, the language I found
a little odd) that the errors_to setting in routers can be set to an empty
string to prompt exim to discard the email. I have set errors_to = "" in
every router and yet the desired behaviour has not come about (yes I
restarted exim.)

I am using exim 4.69

More than once I have asked this question and have had it misunderstood, so
I'm just going to restate it briefly: I want to prevent exim from notifying
the sender of an email that their email has bounced.

Thank you,
Ludasha