Re: changing 550 error code

nigel cox:
> 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.

Sorry, every 5XX code is final. If the sender retransmits, they
need to be educated about RFC 821 which was written more than 20
years ago.

Wietse