changing 550 error code

Hi,

Is it possible to change the error code sent back to the upstream client /
server?

Specifcally, we have in place a body-check that bars certain extensions in
attachments. These errors return a "550" error followed by our REJECT text.
I would prefer a 561 "Media not supported, permanent error".

This feels like a more appropriate error in the circumstances and as 550
errors get stripped down to "550 Unknown System Error" quite often,
resulting in the mail being requeued and resent this prevents unnecessary
usage of bandwidth.

Thanks in advance,

Nigel


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