On 2003-12-21 10:52:22 -0500, Keith C. Ivey wrote: > Guillaume Filion <[EMAIL PROTECTED]> wrote: > > > It might be simpler to make an SMTP connection to the MX RR of > > the sender's domain, and maibe even do a MAIL FROM: <>, RCPT TO: > > $senderAddress to do a simple address check. > > > > If the sender's SMTP server is not available, we can return a > > temporary error code. > > Aagh, no! That's what Verizon seems to be doing nowadays,
Hasn't somebody here posted a plugin to do this recently? Anyway, at
least exim has been able to do this for some time, and other MTAs are
following.
> and it's leading to larger mail queues everywhere.
Noticeable? Sure it may take a few seconds to verify the email address
that way, but other common tests (esp. DNS lookups) also take a lot of
time.
What I'm more concerned about is that this is will probably help only
for a short time: Then the spammers will switch to using existent
addresses.
> And what happens if the SMTP server you're trying to connect to wants
> to do the same thing?
Nothing. Because of the MAIL FROM: <>, the other party can't do the
reverse check.
hp
--
_ | Peter J. Holzer | In this vale
|_|_) | Sysadmin WSR | Of toil and sin
| | | [EMAIL PROTECTED] | Your head grows bald
__/ | http://www.hjp.at/ | But not your chin. -- Burma Shave
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