[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:64 SirLouen]:
 > But this goes beyond this change. Also I need to get a better picture of
 that specific statements regarding "invalid return-path". Because its not
 invalid but not existing. Can you provide us with more literature
 regarding this issue?

 I think the best discussion of this is probably in RFC 5321 Section 6.2:

 https://datatracker.ietf.org/doc/html/rfc5321#section-6.2

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Ticket URL: <https://core.trac.wordpress.org/ticket/64368#comment:67>
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