id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc
12728	Duplicate mime headers in MS activation emails	nacin		"Original MU ticket: http://trac.mu.wordpress.org/ticket/1121

From barry:
>PHPMailer *should* detect the presence of an existing MIME-Type header and not add a new one. If you were/are using an old version of wp_mail() however, which also set an explicit MIME-Type header (pre  http://core.trac.wordpress.org/changeset/5764), you end up with duplicate headers before ever getting to PHPMailer. PHPMailer does not remove headers, so you end up with dupe headers in your email. I don't really see any good reason to set explicit MIME-Type headers in the calling function, and I think they should be removed. Patch attached."	defect (bug)	closed	normal	3.0	Mail		normal	fixed	multisite has-patch needs-refresh