From: Andras Galos (galosanetinform.hu)
Date: Tue Feb 12 2008 - 18:04:46 CST

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Wietse Venema wrote:
> And what evidence do you have that hanging up without reply would
> result in different remote SMTP client behavior than sending a 421
> reply and hanging up?

I'm rather afraid of. 421 means try again, while hangup says this is a
bad MX, try another one.
And there is a chance that this fake reply will be shown to the sender
instead of the real one on the real MX.
And a hangup compares better to a firewalled port 25, which setup just
works well.

Best regards,
Andras Galos

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