[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 Monarobase):

 Not existing is invalid because RFC standards state that it's a mailbox.

 If it's not existing then it's not a mailbox.

 Mailbox definition is here :
 https://datatracker.ietf.org/doc/html/rfc5321#section-2.3.11

 SMTP defines the reverse-path (envelope MAIL FROM / what becomes Return-
 Path) as a sender mailbox
 RFC 5321 (SMTP) :
  - “The reverse-path consists of the sender mailbox.”
 https://datatracker.ietf.org/doc/html/rfc5321#section-4.1.1.2

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Ticket URL: <https://core.trac.wordpress.org/ticket/64368#comment:66>
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