I'm having problems with certain characters when using the drupal_mail() function.

Here is the apache error.log entry for the issue:

Ignoring invalid 'To:' recipient address '=?UTF-8?B?IsWgxZLFvcWhxZPFvsW4wqXCtcOAw4HDgsODw4TDhcOGw4fDiMOJw4rDi8OMw40=?= =?UTF-8?B?w47Dj8OQw5HDksOTw5TDlcOWw5jDmcOaw5vDnMOdw5/DoMOhw6LDo8Okw6XDpg==?= =?UTF-8?B?w6fDqMOpw6rDq8Osw63DrsOvw7DDscOyw7PDtMO1w7bDuMO5w7rDu8O8w73DvyI=?= =?UTF-8?B?IDxjaXRyaWNndXlAZ21haWwuY29tPg==?=' Transaction aborted: no recipients specified

For sake of example, what would be the simplest way to successfully send an email (In the RFC2822 format of "User <[email protected]>") to:

ŠŒŽšœžŸ¥µÀÁÂÃÄÅÆÇÈÉÊËÍÎÏÐÑÒÓÕÖØÙÚÛÜÝßàáâãäåæçèéêëìíîïðñóôõöøùúûýÿ <[email protected]>

Currently drupal_mail() fails with:

"Unable to send e-mail. Contact the site administrator if the problem persists."

Preferably, I would like to be able to keep these special characters intact.

Otherwise, could I use a project like Transliteration or Pathauto to convert or prepare the string? If so, which project and function should I use to prepare the "To" name?

Drupal Log Message: enter image description here

  • The watchdog log (dblog.module) should contain more information, including the actual error message.
    – Berdir
    Oct 5, 2011 at 3:52
  • Attached a graphic of the error from watchdog. :)
    – Citricguy
    Oct 5, 2011 at 4:47

1 Answer 1


All credit to @deceze

Original Solution

In short:


$name  = '山本';
$email = '[email protected]';
$addr  = mb_encode_mimeheader($name, 'UTF-8', 'Q') . " <$email>";

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