[wp-trac] [WordPress Trac] #49687: wp_mail() - Why is no envelope sender defined?

[WordPress Trac]

#49687: wp_mail() - Why is no envelope sender defined?
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 Reporter:  vbbp                                  |       Owner:  SirLouen
     Type:  enhancement                           |      Status:  closed
 Priority:  normal                                |   Milestone:  6.9
Component:  Mail                                  |     Version:  5.4
 Severity:  major                                 |  Resolution:  fixed
 Keywords:  has-test-info has-patch has-dev-note  |     Focuses:
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Comment (by SirLouen):

 Replying to [comment:48 jamieburchell]:
 > `sendmail_from` is a Windows only configuration option. Hence the need
 to add `-f` to the sendmail path in Linux:
 >
 > > sendmail_from string
 > > Which "From:" mail address should be used in mail sent directly via
 SMTP (Windows only). This directive also sets the "Return-Path:" header.

 I have to admit that this is very poorly explained and can easily lead to
 confusion; this is why some people don't use it correctly.
 As you can see, there are two parts:
 1. `Which "From:" mail address should be used in mail sent directly via
 SMTP (Windows only)`
 2. `This directive also sets the "Return-Path:" header.`

 There are some specific SMTP mailing functions for enabling Windows hosts
 such as `SMTP` and `smtp_port`. With `sendmail_from` you can set the
 `from` field for such.

 But, the real utility of `sendmail_from` was to send the `Return-Path`
 header which MDA use to set the Sender envelope.

 Yesterday my first thought was the idea provided by @siliconforks of
 simply removing the `Sender` parameter in phpmailer.

 Replying to [comment:49 siliconforks]:
 > If anyone is running WordPress 6.9 and wants to revert to exactly the
 way it behaved in WordPress 6.8, I believe that the following code should
 work:
 >
 > {{{#!php
 > <?php
 > add_action( 'phpmailer_init', static function ( $phpmailer ) {
 >       $phpmailer->Sender = '';
 > } );
 > }}}

 This may only work in the scenario that there are no two conflicting
 `Sender` addresses, but the fact that the user actually doesn't have the
 default route for `sendmail` binary configured correctly in `php.ini`. But
 this is a flawed workaround, since the server is poorly configured and we
 are leaving it like that. Ideally in this scenario, the server should be
 correctly configured, and if we want to force the `-f` the use
 `isSendMail`. But if the host owner is not willing to update, then this
 could be a good idea to try.

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Ticket URL: <https://core.trac.wordpress.org/ticket/49687#comment:50>
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