[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 digitalblanket):

 We host on Cloudways. We discovered yesterday that a client site with SMTP
 settings set through the phpmailer_init hook was now ignoring the
 $phpmailer->From address value we set, reverting to the address set within
 the email itself (Gravity Forms notofications in this case, which were
 still set to use the default admin_email From address). This causes the
 emails to be rejected by the client's Office365 HVE SMTP.

 It sounds like we should be setting $phpmailer->From and
 $phpmailer->Sender now to overcome this? If so that's a massive change
 which is not at all explained in the WP 6.9 changelog!

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Ticket URL: <https://core.trac.wordpress.org/ticket/64368#comment:5>
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