CiviMail: non-US-ASCII From: names can cause email validation error

Cf. CRM-4631 but this time with CiviMail.

To replicate:
(1) At From Email Address Options, configure a From Email Address with a non-US-ASCII character in the name, e.g. (email disguised):
"Test Región" <davej@my.dom>
(2) Set up a mailing using this From address and send a test mail.

Result:

Dec 01 18:10:11 [info] $Fatal Error Details = Array
(
[callback] => Array
(
[0] => CRM_Core_Error
[1] => handle
)

[code] =>
[message] => Validation failed for: =?utf-8?Q?"CiviCRM=20Test=20Mailer=20(Test=20Regi=C3=B3n)"=20<dave?= =?utf-8?Q?j@my.dom>?=
[mode] => 16
[debug_info] =>
[type] => PEAR_Error
[user_info] =>
[to_string] => [pear_error: message="Validation failed for: =?utf-8?Q?"CiviCRM=20Test=20Mailer=20(Test=20Regi=C3=B3n)"=20<dave?= =?utf-8?Q?j@my.dom>?=" code=0 mode=callback callback=CRM_Core_Error::handle prefix="" info=""]
)

Dec 01 18:10:11 [info] $backTrace = (snip)/sites/all/modules/civicrm/CRM/Core/Error.php, backtrace, 190
, handle,
(snip)/sites/all/modules/civicrm/packages/PEAR.php, call_user_func, 912
(snip)/sites/all/modules/civicrm/packages/PEAR.php, PEAR_Error, 576
(snip)/sites/all/modules/civicrm/packages/Mail/RFC822.php, raiseError, 198
(snip)/sites/all/modules/civicrm/packages/Mail.php, parseAddressList, 159
(snip)/sites/all/modules/civicrm/packages/Mail/smtp.php, prepareHeaders, 258
(snip)/sites/all/modules/civicrm/CRM/Mailing/BAO/Job.php, send, 363
(snip)/sites/all/modules/civicrm/CRM/Mailing/BAO/Job.php, deliverGroup, 313
(snip)/sites/all/modules/civicrm/CRM/Mailing/BAO/Job.php, deliver, 137
(snip)/sites/all/modules/civicrm/CRM/Mailing/Form/Test.php, runJobs, 255
, testMail,
(snip)/sites/all/modules/civicrm/packages/HTML/QuickForm.php, call_user_func, 1591
(snip)/sites/all/modules/civicrm/CRM/Core/Form.php, validate, 291
(snip)/sites/all/modules/civicrm/CRM/Core/StateMachine.php, validate, 148
(snip)/sites/all/modules/civicrm/CRM/Core/QuickForm/Action/Next.php, perform, 63
(snip)/sites/all/modules/civicrm/packages/HTML/QuickForm/Controller.php, perform, 203
(snip)/sites/all/modules/civicrm/packages/HTML/QuickForm/Page.php, handle, 103
(snip)/sites/all/modules/civicrm/CRM/Core/Controller.php, handle, 249
(snip)/sites/all/modules/civicrm/CRM/Core/Invoke.php, run, 209
(snip)/sites/all/modules/civicrm/drupal/civicrm.module, invoke, 333
, civicrm_invoke,
(snip)/includes/menu.inc, call_user_func_array, 348
(snip)/index.php, menu_execute_active_handler, 18

Civi 3.0.2
Drupal 6.14
PHP 5.2.11
Apache 2.2.3
MySQL 5.0.45

Dave J