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From: Michael C on 20 Oct 2009 20:07
On Oct 20, 6:40 am, Joe Brennan <bren...(a)columbia.edu> wrote:
> This can be done with the Mimedefang milter.  You have to write your
> own code in perl to put the To and Cc into variables and get the
> length, but Mimedefang gives you a work file with the header lines and
> a function to replace them, so it's not too hard to write.  We change
> an overly long To or CC to contain "many recipients :;" instead-- and
> I use that wording to identify our change vs the usual "undisclosed
> recipients :;" without having to look at the log.  We make the change
> at 100 addresses.  This has really cut down the number of reply-all
> storms.

This is what we needed. It turns out we can easily perform the same
action one
MX down the chain using an IronPort filter, which act as our delivery
layer.
I've already tested in dev and it works like a champ, and also very
much like using
the "many recipients" alias.

Thank you Joe.

- Michael

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