[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):

 Replying to [comment:61 Monarobase]:
 > **What's not easy for a web host** is to fix the issue added by
 WordPress 6.9 without adding a plugin to customers websites which would
 require their consent and would cause a lot of support requests.

 For me, it is particularly strange that you were so relaxed before 6.9
 about the fact that From and Sender were not aligned, but now you are so
 obsessed about the validity of the return-path inbox. Spam Scoring wise
 DMARC failing is way higher than this.

 > Rewriting all wordpress@… to system_user@… : We cannot do this because
 we can't be sure that a customer does not use wordpress@…

 Still if you feel that is so important, can't you simply check if
 `wordpress` local is already created in your mail system and simply create
 aliases with `wordpress@` for those that don't have it? Or if this is too
 complicated for you, why not simply add a catchall?

 I think this is going far beyond the scope of this ticket anyway.

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Ticket URL: <https://core.trac.wordpress.org/ticket/64368#comment:62>
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