We run a list of our mailman listserver that our public school sysadmins use to 
share info.  The problem is - a lot of them have become Google schools, and 
Google has a problem with list servers.

Each post winds up going to multiple Google mail domains, and they bounce:

 stat=Deferred: 451-4.3.0 Multiple destination domains per transaction is 
unsupported.

meaning the emails are queued, sometimes for quite a while, as the system sends 
each domain, one attempt (and one mess of deferrals) at a time.

Is there a setting I can change or add that would allow mailman to kind of 
bundle each domain, open a thread, and send one-thread-per-domain or 
one-domain-per-thread to alleviate the issue?

We are a bit behind, using Mailman version: 2.1.20

--
Jeff

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