[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:  needs-testing  |     Focuses:
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Comment (by studiomondiale):

 Replying to [comment:2 siliconforks]:
 > That post is a few years old so I can't be certain it's still accurate
 today, but it does seem to suggest that DomainFactory likes putting the
 `-f` option in their `sendmail_path` value.

 I'm the reddit user who initially posted this and I can confirm that this
 is still what Domainfactory does, at least on our server, which is causing
 the issue.

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Ticket URL: <https://core.trac.wordpress.org/ticket/64368#comment:7>
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