[wp-trac] [WordPress Trac] #39775: wp_mail miss send Content-Type with boundary when array header does not have other custom headers

[WordPress Trac]

#39775: wp_mail miss send Content-Type with boundary when array header does not
have other custom headers
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 Reporter:  kn007         |       Owner:  (none)
     Type:  defect (bug)  |      Status:  closed
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  Mail          |     Version:
 Severity:  normal        |  Resolution:  duplicate
 Keywords:                |     Focuses:
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Changes (by SirLouen):

 * status:  new => closed
 * resolution:   => duplicate


Comment:

 It's not being ignored by `wp_mail` but by PHPMailer. When setting custom
 headers, the `boundary` is removed as it fallback as a regular `plain`
 email.

 Already reported upstream, and this has become essentially a duplicate of
 #15448

 When we sort out the multipart problem, this will be sorted also. I hope
 we can achieve this before 6.9 release. Stay tuned to the other report.

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Ticket URL: <https://core.trac.wordpress.org/ticket/39775#comment:2>
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