[wp-trac] [WordPress Trac] #35069: Allow short-circuiting wp_mail

[WordPress Trac]

#35069: Allow short-circuiting wp_mail
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 Reporter:  DvanKooten                           |       Owner:
     Type:  enhancement                          |      Status:  assigned
 Priority:  low                                  |   Milestone:  Future
Component:  Mail                                 |  Release
 Severity:  normal                               |     Version:
 Keywords:  has-patch has-unit-tests needs-      |  Resolution:
  refresh                                        |     Focuses:
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Comment (by Mte90):

 I am trying to understand what are the next steps to improve that patch
 but I didn't got it.
 Actually if the filter return false is fine, `wp_mail` works without issue
 but if there are other values `wp_mail` stop and return that value.
 So if an alternative mailer wants to add a different behaviour can hook in
 that filter and can return everything. Only false is not allowed but the
 alternative mailer needs to sent also that value.

 In the docs of the filter we are talking of a Trusthy value so it can be a
 boolean or not. Using `null` as suggested can help the dev to output the
 status that he prefer like `true` or `false` and we don't have any issue
 because the alternative mailer can handle as it prefer.

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Ticket URL: <https://core.trac.wordpress.org/ticket/35069#comment:26>
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