[wp-trac] [WordPress Trac] #22492: Duplicate MIME-Version header

[WordPress Trac]

#22492: Duplicate MIME-Version header
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 Reporter:  ryderlewis       |       Type:  defect (bug)
   Status:  new              |   Priority:  normal
Milestone:  Awaiting Review  |  Component:  Mail
  Version:  3.4.2            |   Severity:  minor
 Keywords:                   |
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 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.

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Ticket URL: <http://core.trac.wordpress.org/ticket/22492>
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