Make sure the server is setup to handle the number of emails per hour. Most servers - shared are set to 100 emails per hour limit, most dedicated or semi dedicated servers are set to allow 250 emails per hour. This is per website on the server.
Since I have a dedicated server, that hosts my vBulletin forums, I have it set to unlimited as I can have over 2200 emails per hour in / out.
Once you reach the limit, it no longer sends emails out, and does not inform you that you went over the allowed limit. Contact your server host and ask them to check your email logs to see what happend to those emails. If they tell you your going over the limit, ask them nicely to increase the hourly limit.
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