Daniel L. Miller:
> >> I've been using recipient verification for some time with good
> >> results but I think I need to make an adjustment to accommodate the
> >> changing email world. It appears a number of servers have adopted
> >> minimal greylisting - such that they immediately reject initial
> >> contacts but have a minimal timeout (just a few seconds) before
> >> accepting.
>
> I'm using the "reject_unverified_recipient" parameter on all mail. That
> way when a user mistypes a recipient address they get instant feedback -
> if they're told "message sent" then it actually got somewhere (unless
> the remote server swallows garbage recipients).
>
> My question is how to tune it - my first guesses involve
> "address_verify_poll_count" and "address_verify_poll_delay" but I don't
> want to make adjustments blindly.
There parameters will not change the result.
reject_unverified_recipient will stop as soon as it has a reply
from the SMTP server (or from the local verify cache).
If that result is "4XX Come back in a few seconds", then
reject_unverified_recipient will not wait for a few seconds.
Wietse
