Well, I've been using this since above on my .net for quite a while, and had such succuess that I moved all of my mail to the services and I couldn't be happier... You know, 10 redundant servers sure beats my one...
I run Jabber for my .com/.net for undergroundnews, and on another as well... not hard to setup so long as you can create SRV records in your DNS

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Overall, a great, free, service
