On 30/03/12 21:02, Maciej Uhlig wrote: > So, google.com got 450 from postscreen and repeated delivery from > _other_ IP and then got another 450. It's possible the mail would not be > delivered at all if google.com had sent it from different 60 thousands > :-) IP addresses every time. > > The cure could be DNS whitelisting but we know it's not applicable in > postscreen's permanent whitelist. We added then IP subnet 74.125.0.0/16 > to permanent whitelist. But we know there are other ISPs who could send > mail in a similar way.
I've only seen this issue from google. You can get a list of possible IPs for them by checking their SPF record, after adding all the networks from their SPF record I stopped having this issue. Peter
