Petr Novotny <[EMAIL PROTECTED]> schrieb/wrote:
> 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.
Well, it depends: If you end up accepting too much mail to invalid
addresses, checking in advance is cheaper than sending out many bounces.
If you only receive a few messages with bogous destinations, validating
the address for all mails has probably a higher cost.
It also depends on the speed of the machine and the bandwith its
connection to the Internet has.
--
Claus Andre Faerber <http://www.faerber.muc.de>
PGP: ID=1024/527CADCD FP=12 20 49 F3 E1 04 9E 9E 25 56 69 A5 C6 A0 C9 DC
