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

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