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It's not one ISP i'm having trouble with, it's quite a number of ISPs unable to accept mail. It's DNS errors, timeouts and failed mail on the outgoing side and a general increase in spam and polling errors on the incoming side (ISPs reporting too many connections).
Help: Forget the RAC, send for Bicycle Repair Man!
I've seen quite a presence - it's like the biggie a couple of months ago - probably this is either the cause or a little extra spice.