rob0:
>However, BTW a surprising number of legitimate sites, including?
>Gmail, have not been trying the lower-priority MX at all. Gmail
>clients also tend to pass off to another host for second and
>subsequent attempts, always and only on the primary MX IP address.
Steve Fatula:
>I don't see how Gmail will work, at times using this method as is.
>Gmail often sends the follow up second email from another mail
>server IP from my experience. So, how will this work with the deep
>tests mode of postscreen? I would think some mail will end up
>bouncing. What else can happen when the follow up comes from a
>different ip?
Surely the sender has a limited number of IP addresses. Once a
client IP address passes postscreen's "after 220" tests, it is
whitelisted and can send mail without "after 220" tests for 30 days.
postscreen_bare_newline_ttl = 30d
postscreen_non_smtp_command_ttl = 30d
postscreen_pipelining_ttl = 30d
If this delay bothers you, don't turn on postscreen's "after 220"
tests and don't use greylisting.
Wietse
