[wp-trac] [WordPress Trac] #64368: `Could not instantiate mail function` errors sending mail in 6.9

[WordPress Trac]

#64368: `Could not instantiate mail function` errors sending mail in 6.9
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 Reporter:  desrosj          |       Owner:  SirLouen
     Type:  defect (bug)     |      Status:  accepted
 Priority:  normal           |   Milestone:  6.9.1
Component:  Mail             |     Version:  6.9
 Severity:  normal           |  Resolution:
 Keywords:  has-patch close  |     Focuses:
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Comment (by jorbin):

 @SergeyBiryukov @SirLouen Can either of you share some more information
 about how you tested [61468] to ensure it fixes this issue?

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Ticket URL: <https://core.trac.wordpress.org/ticket/64368#comment:75>
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