[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 siliconforks):

 Replying to [comment:51 SirLouen]:
 > 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.

 But because the SPF record for the WordPress site's domain wasn't actually
 used, it didn't matter if there was a bad SPF record (or if there was no
 SPF record at all).  DreamHost was using some address like
 `user at pdx1-shared-a2-09.dreamhost.com` as the envelope sender, so it would
 use the SPF record for `dreamhost.com`, not the WordPress site's domain.

 Of course, such a configuration would have other problems (e.g., it would
 be impossible to pass DMARC).  But it may have been sort of working
 before, at least enough to pass SPF and get the mail delivered...

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Ticket URL: <https://core.trac.wordpress.org/ticket/64368#comment:52>
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