The bridgehead box(es) can be running IMail, IMGate, MS SMTP, qmail, whatever. IMail can't do what IMGate can for anti-spam, but it can perform this role very well (especially IMail 8).
but you have to buy IMail + Windows Server licenses ( = $2000?) for the Imail routing hubs, IMGate is free.
Len
_____________________________________________________________________ http://MenAndMice.com/DNS-training: New York; Seattle; Chicago IMGate.MEIway.com: anti-spam gateway, effective on 1000's of sites, free
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