If you look at your server error logs, do you see their emails? It should tell you if there is an error trying to send it to that address.
Take a look at this - http://mxtoolbox.com/SuperTool.aspx?...&run=toolpage# - you may not have email set up correctly on your server and it may be getting rejected when sent.
Take a look at this - http://mxtoolbox.com/SuperTool.aspx?...&run=toolpage# - you may not have email set up correctly on your server and it may be getting rejected when sent.
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