On Thu, 29 Jun 2006, Robert Millan wrote:
>
> Besides, in the long term, this should get better. After all, 551 is a
> standard response defined in RFC 2821. I don't see why any MTA wouldn't
> want to support it in the sender side.
Because it has been obsolete and unsupported for decades. There are lots
of features in old IETF protocols which are vestigial remnants that have
almost never been used.
Tony.
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