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Authorize.net - SMTP Mail Error at Confirmation


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When I click on "Confirm" to finish the credit card processing in my checkout I get the following error message: Can anyone help me?


Warning: mail() [function.mail]: SMTP server response: 501 5.5.4 Invalid Address in d:websitesxtremelyfitcomshopcatalogincludesclassesemail.php on line 500


Warning: Cannot modify header information - headers already sent by (output started at d:websitesxtremelyfitcomshopcatalogincludesclassesemail.php:500) in d:websitesxtremelyfitcomshopcatalogincludesfunctionsgeneral.php on line 29

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