some comments in the sugar crm/vtiger source code

// handle content-type section in headers
            if(strtolower($key) == 'content-type' && strpos($value, ';')) { // ";" means something follows related to (such as Charset)
                /*     Outlook can't fucking follow RFC if someone PAID them to do it...
                    oh wait, someone paid them NOT to do it. */
                $semiColPos = mb_strpos($value, ';');
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