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Error in decoding BASE64

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I have oscommerce 2.3.4 running with php 5.6.40, hosted on a linux server. Since beginning of September, I have the following problem: when a client insert non-ASCII characters (mainly Greek letters) in the name field of the contact or order form, I get a base64 encoded Header sent to my email address and an "Undelivered Mail Returned to Sender" in case of order. Since the content is fine, there must be a problem with the MIME header. With ASCII characters, everything's fine. Any ideas?


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@NerysIt is an encoding problem. Languages like Greek require extra space to store the characters. You can try changing the CHARSET define in includes/languages/english.php, or whichever language file you use to the following but you will probably need to change the database to use UTF-8. Ask your host to do that if you don't know how.

define('CHARSET', 'utf-8');


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