I've sent several test emails from my website, and it doesn't work on either Firefox or Safari (I don't have Internet Explorer, so can't test on that).
Contact form not working, not receiving emails2 posts from 2 voices
Some hosters seem to have problems with the standard contact form. Please try if plugins like: http://wordpress.org/extend/plugins/contact-form-7/ or http://www.deliciousdays.com/cforms-plugin/ work for you.
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