[Exim] Should I allow "MAILER-DAEMON@" as a sender without v…

Hi there,

I just noticed that some auto-reply was blocked by Exim 4.1 because the sender
mailbox isn't accepted on the sender's MX:

  sender verify fail for <MAILER-DAEMON@???>: response to
    "RCPT TO:<MAILER-DAEMON@???>" from fw-btv-rz.bayernoil.de
    [62.153.86.59] was 550 Mailbox unavailable: This site may not be used as a
    relay agent.

Should I always accept senders of MAILER-DAEMON@ without verifying that they
really exist, or can one say that the sender's MX is broken if it doesn't accept
mail to MAILER-DAEMON@ and thus I should NOT change my Exim configuration? Any
pointers to some relevant RFC?

Thanks,

Ralf

--
Sign the EU petition against SPAM:          L I N U X       .~.
http://www.politik-digital.de/spam/        The  Choice      /V\
                                            of a  GNU      /( )\
                                           Generation      ^^-^^