At 12:56 PM +0000 2/23/06, Tony Finch wrote:
For example, it's common to have dual-purpose MSA
and MX servers which operate in MSA mode after AUTH and MX mode otherwise.
If the client pipelines an AUTH and an intended submission, but the auth
fails, bad things will happen - recipients will be rejected that would
have been OK, an incomplete message will suffer an anti-spam penalty
instead of being fixed up, etc.
Another reason to stop running dual-purpose servers on port 25, and
restrict 25 to message relay, and use port 587 for message
submission. It makes the client's intent much more clear.
Opinions are personal; facts are suspect; I speak for myself only
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"Contrariwise," continued Tweedledee, "if it was so, it might
be, and if it were so, it would be; but as it isn't, it ain't. That's