On Fri, Mar 10, 2000 at 09:06:48AM +0100, Petr Novotny wrote:
> > I believe it's better not to accept that mail in the first place.
>
> Correction: It would be better if it was for free. Unfortunately,
> checking whether a username exists (against large database) can
> be arbitrarily slow; unless you're planning to overload your busy
> box, forget it; qmail-smtpd just carries on the conversation,
> qmail-queue writes down the message, fsync()es it and you're done.
Are you saying that spending a few more resources checking up valid
usernames is better than accepting possibly large emails, and then
attempting to bounce them, and spending bandwidth, time and qmail-remote
slots, which would be better used for genuine outgoing emails?
I think the problem of slow lookups in large databases has gone away
with CDB.
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