Mike Cardwell:
> server and sending "RCPT TO". I'm not talking about that, I'm talking
> about asking Postfix if the syntax of the address is valid and if the
> DNS is set up suitably to be able to potentially be able to deliver
> the message. I.e, are there valid MX records etc. That is how Exim
> does it at least.
That's not what Sendmail does, as far as I recall. You know, the
program whose name appears in "sendmail -bv".
There hasn't been demand for what you ask in the 17 years that
people have used Postfix. It could be implemented with another
postqueue command option that connects to the verify daemon, perhaps
with a flag that says don't talk to remote servers. This runs an
email address through Postfix's "routers" and agents that know how
to deliver mail. If the mail queue is not congested then this
produces a result in seconds.
Wietse
