[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     |     Focuses:
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Comment (by westonruter):

 Replying to [comment:44 SirLouen]:

 > This is fixed for now
 [https://core.trac.wordpress.org/ticket/64368#comment:36 with the
 workaround provided here].

 This workaround is also now available through the
 [https://wordpress.org/plugins/hotfix/ Hotfix] plugin. This is written up
 in the just-published
 [https://make.wordpress.org/core/2025/12/12/wordpress-6-9-hotfixes/
 WordPress 6.9 Hotfixes] post on Make/Core.

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Ticket URL: <https://core.trac.wordpress.org/ticket/64368#comment:46>
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