Steve Fatula:
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> >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.
>
>Of course, it's finite. It's not small though. Here's the SPF record:
>
>ip4:216.239.32.0/19 ip4:64.233.160.0/19 ip4:66.249.80.0/20
>ip4:72.14.192.0/18 ip4:209.85.128.0/17 ip4:66.102.0.0/20 ip4:74.125.0.0/16
>ip4:64.18.0.0/20 ip4:207.126.144.0/20 ip4:173.194.0.0/16
>
>
>That's a *lot* of ips.?
In my experience, gmail does not send one message from a massive
number of IP addresses. It copes with greylisting just fine, which
does not surprise me, considering that greylisting is such a
widely-used technique.
Wietse
