Magento – Logo image not showing on transactional emails in Magento 1.7.0.2

In Zend Framework,magento/lib/Zend/Mime.php implements a const LINELENGTH = 72; but the constant is overwritten in app/code/core/Zend/Mime.php and set to 200. You can overwrite app/code/core/Zend/Mime.php using Magento's regular mechanisms and change the implementation of the encode method, replacing self::LINELENGTH with a different constant:

public static function encode($str, $encoding, $EOL = self::LINEEND)
{
    switch ($encoding) {
        case self::ENCODING_BASE64:
           // original: return self::encodeBase64($str, self::LINELENGTH, $EOL);
           return self::encodeBase64($str, 72, $EOL); // hardcoded value, just to emphasize the meaning

        case self::ENCODING_QUOTEDPRINTABLE:
            return self::encodeQuotedPrintable($str, self::LINELENGTH, $EOL);

        default:
            /**
             * @todo 7Bit and 8Bit is currently handled the same way.
             */
            return $str;
    }
}

/Edit: initially I replaced self::LINELENGTH with Zend_Mime::LINELENGTH; this won't work because the autoloader will always load the Zend_Mime class from Magento core instead of the one from lib/Zend.

After weeks of research and troubleshooting cron jobs in magento 1.9.2.2, i have finally found a solution from another forum. It worked without having to edit any coding.

From magento connect manager install ASCHRODER SMTP plugin and configure appropriately by going to;

System -> Configuration -> ASCHRODER EXTENSIONS -> SMTP -> Queue Configuration -> Queue Usage -> Never

Order Confirmation will be sent quickly.