malformed email subject header when subject > 75 chars using codeigniter email lib

Question

I\'m getting some garble in my MIME headers when the subject is over 75 chars. When the line break is encoded in the header there is an extra line break that is invalid.

Answer 1

Since I myself had this exact problem I will share the solution here since the one shared does not work with version 2.2

Find this piece of code located in system/libraries/Email.php:365

public function subject($subject)
{
    $subject = $this->_prep_q_encoding($subject);
    $this->_set_header('Subject', $subject);
    return $this;
}

With this one

public function subject($subject)
{
    $subject = '=?UTF-8?B?'.base64_encode($subject).'?=';
    $this->_set_header('Subject', $subject);
    return $this;
}

Answer 2

Apparently this is a known issue, caused by Subject lines > 75 chars.

http://codeigniter.com/forums/viewthread/154493/P15/#925385

The fix was to change the email config like this:

$config['newline'] = "\r\n";
$config['crlf']    = "\n";