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mailsystem_wrap_mail() does its job by calling wordwrap() function which doesn't support UTF-8. The observable result is UTF-8 byte sequence can be broken into two lines in the middle.
Comments
Comment #1
maximpodorov CreditAttribution: maximpodorov commentedSome examples of UTF-8 compatible implementations:
http://www.php.net/manual/en/function.wordwrap.php