[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:  close         |     Focuses:
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Comment (by siliconforks):

 Replying to [comment:10 SirLouen]:
 > Could not execute: /usr/sbin/sendmail -finfo at domain.name -t -i

 It looks like he is setting `$phpmailer->Sendmail` to a complete command
 line, with options?  I think it's just supposed to be the path,
 `/usr/sbin/sendmail`, no options.  PHPMailer is supposed to set all the
 options.  (This is a bit different from the way `sendmail_path` works.)

 > sendmail_path = /usr/sbin/sendmail -finfo@… -t -i

 I'm confused about that one - the `-t` and the `-i` are fine, but the `-f`
 is still not supposed to be there.  Isn't that what caused his issue in
 the first place?

 > So with this in mind, the second one from @digitalblanket is because, if
 the `Sender` is set up, then it will set the `From` to the `Sender` if
 they are setting the `$phpmailer->From` instead of using the
 `wp_mail_from` hook, that will eventually set the `From` and the `Sender`
 at the same time with the same value. In his case, the patch coming to
 6.9.1 will not solve anything.

 Yes, in his case I think that it may require manual intervention by him to
 fix the problem.

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Ticket URL: <https://core.trac.wordpress.org/ticket/64368#comment:11>
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