id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc
22492	Duplicate MIME-Version header	ryderlewis		"In certain cases, Wordpress sends emails containing two ""MIME-Version"" headers. This causes email rejections from some Amazon SES SMTP servers in particular.

To reliably reproduce, a default multisite install with BuddyPress can be used. When a user tries to register and create a website, the activation email contains this bug. Unfortunately I don't know how to reproduce this error with Wordpress itself, but I believe this bug is related to the Wordpress core. If any plugin happens to set a custom header of ""MIME-Version"" to an email message, Wordpress core is the culprit for the insertion of the duplicate mail header.

Patch attached to this report, it's a trivial fix. All the fix does is checks to see if ""MIME-Version"" was already included in custom mail headers, and if so, don't insert the duplicate header."	defect (bug)	new	normal	Awaiting Review	External Libraries	3.4.2	minor