id,summary,reporter,owner,description,type,status,priority,milestone,component,version,severity,resolution,keywords,cc,focuses 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,has-patch needs-refresh,,multisite