[1.2.X] Fixed #15520 -- Fixed incompatibility with email module shipped with...

[1.2.X] Fixed #15520 -- Fixed incompatibility with email module shipped with Python 2.4 introduced in r15669. Thanks dobcey for the report.

Backport of [15675] from trunk

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@15676 bcc190cf-cafb-0310-a4f2-bffc1f526a37