Mail delivery failed: returning message to sender

    For every message that I send to this list, I get one of these:

>This message was created automatically by mail delivery software (Exim).
>
>A message that you sent could not be delivered to one or more of its
>recipients. This is a permanent error. The following address(es) failed:
>
>   vbeek@phys.uu.nl
    And so forth, including a copy of the original.  What's up with this?

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