> I don't quite get this. Your outbound MTA is grouping separate domains
> together into one queue based on MX?
There are various ways to do it, but the basic idea is to reuse connections
and even transactions based on different domains translating to a common
set of MXes, for some defintion of "common".
Variations include doing it for all messages, for specific MX lists, for
domains who MX lists contain a specific subset MX list, by MX IP, etc.
Some people swear by these mechanisms. Others swear at them.
> Or is it trying to relay some other mail through Google when at least
> one recipient is hosted on a Google MX?
That would be very broken, and AFAIK nobody does that.
Ned
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