[wp-trac] [WordPress Trac] #63127: wp_mail resets custom headers when headers array is set to empty, causing loss of custom header data (e.g., boundary)

[WordPress Trac]

#63127: wp_mail resets custom headers when headers array is set to empty, causing
loss of custom header data (e.g., boundary)
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 Reporter:  regnalf       |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  Mail          |     Version:  6.7.2
 Severity:  normal        |  Resolution:
 Keywords:                |     Focuses:
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Comment (by joemcgill):

 Thanks @regnalf. It looks like custom data gets processed in the following
 block after saving the $headers data to a $tempheaders variable.

 See: https://github.com/WordPress/wordpress-
 develop/blob/360732e132c009bedd59cff77511514103077f50/src/wp-
 includes/pluggable.php#L282-L352

 Is there a specific header that you expect to be processed that is not
 being accounted for in that block?

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Ticket URL: <https://core.trac.wordpress.org/ticket/63127#comment:1>
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