You have disabled a system for sending messages over a network to colleague's computers. This, although on the face of it, was a good idea but has been exploited by spammers to send all sorts of messages, 'Juanita Girl' being the most imfamous:-0. You do not need this service so shutting it down will be no bother and will cause no Net problems.
There are plenty of companies that charge $29+ for this info, or they send a small script file that does the same job.
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