On 2/6/2013 1:37 PM, Wietse Venema wrote:
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.
Thank you. Is there an adjustment that will? Or is the manual client
step my only option?
--
Daniel
