techlist06:
> I'm working on converting to using postscreen. Studying the details. I
> have a question from the docs related to the delays due to the effective
> greylisting caused by "Tests after the 220 SMTP server greeting". I believe
> my server would qualify as a small site receiving mail for just a few
> hundred users.
>
> Snippet from the Howto:
> " The following measures may help to avoid email delays: Small sites:
> Configure postscreen(8) to listen on multiple IP addresses, published in DNS
> as different IP addresses for the same MX hostname or for different MX
> hostnames. This avoids mail delivery delays with clients that reconnect
> immediately from the same IP address.
Note, this recommendation applies to clients that reconnect from
the same IP address.
> Can someone help me understand why this helps?
The postscreen temporary whitelist is by client IP address.
> If I add an IP to the server and configure it as a second instance
> of the MX hostname, how does that help with a server that may
> reconnect from a different IP?
Note, the above recommendation applies to clients that reconnect
from above recommendation does not apply.
> I though tthat if it
> reconnected immediately from the same IP, that would be a good thing. Or
> maybe I misunderstood "immediately". I took it to mean immediately after
> getting a 4xx response and drop. I assume this doesn't do anything to help
> with servers like Google that will connect from a different server?
Note, the abive recommendation applies to clients that reconnect
from the same IP address. If still applies when different servers
share the same external (NAT) IP address.
Wietse
