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Multiple Addresses in "Send Extra Emails" causes 501 error


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I am running on a windows box (live server, not local). I have discovered that when I add multiple addresses to the "Send extra emails" field I get the following error:


Warning: mail(): SMTP server response: 501 5.5.4 Invalid Address in C:\hosting\webhost4life\member\sohelpme\catalog\includes\classes\email.php on line 500


Warning: Cannot modify header information - headers already sent by (output started at C:\hosting\webhost4life\member\sohelpme\catalog\includes\classes\email.php:500) in C:\hosting\webhost4life\member\sohelpme\catalog\includes\functions\general.php on line 29



As long as I have only one address I am fine. I tried escaping the comma and using a semicolon instead but neither of those things work. I suspect it has to do with string handling by the PHP engine on the windows platform, but that is just a guess. Has anyone else got a suggestion?

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