[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 SirLouen):

 > The SPF record is just a DNS record like any other and is editable; so
 it's possible that the user may have changed the SPF record in the past
 and now it no longer works properly. This would not have been a problem in
 WordPress 6.8 because the SPF record was essentially unused; however, now
 in WordPress 6.9 the SPF record will be used, so any problems with it will
 surface.

 I wonder where could they go ignoring SPF passing nowadays? It's like the
 bread and butter of deliverability. Anyone with "an unused SPF" might have
 had a perma-spam delivery WordPress system.

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Ticket URL: <https://core.trac.wordpress.org/ticket/64368#comment:51>
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