[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
---------------------------+---------------------
 Reporter:  desrosj        |       Owner:  (none)
     Type:  defect (bug)   |      Status:  new
 Priority:  normal         |   Milestone:  6.9.1
Component:  Mail           |     Version:  6.9
 Severity:  normal         |  Resolution:
 Keywords:  needs-testing  |     Focuses:
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Comment (by siliconforks):

 The user on Reddit who reported this says that he is using DomainFactory
 for hosting:

 https://www.reddit.com/r/Wordpress/comments/1pdu68r/comment/nse0sur/

 I found this discussion which talks about DomainFactory's `sendmail_path`
 configuration:

 https://forum.getkirby.com/t/error-could-not-instantiate-mail-function-
 with-kirby-email/13933/15

 > ...the reason seems to be, that Domainfactory changed their general
 server configuration and now they are forcing a ReturnPath with the
 parameter -f within the sendmail_path in the php.ini (which I cannot
 access)...

 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.

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Ticket URL: <https://core.trac.wordpress.org/ticket/64368#comment:2>
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