[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 has-unit-tests  |     Focuses:
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Comment (by wildworks):

 This ticket was brought up in today's 6.9.1 bug scrub.

 > I think that the safest route for 6.9.1 is to revert [61010] rather than
 upgrade phpmailer.

 I agree with this. Additionally, if we do this, we may need to update the
 Dev Note.

 https://make.wordpress.org/core/2025/11/18/more-reliable-email-in-
 wordpress-6-9/

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Ticket URL: <https://core.trac.wordpress.org/ticket/64368#comment:85>
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