[wp-trac] [WordPress Trac] #49661: mails, Howdy, wp_mail() and filters spreading

[WordPress Trac]

#49661: mails, Howdy, wp_mail() and filters spreading
-------------------------------------------------+-------------------------
 Reporter:  arena                                |       Owner:  SirLouen
     Type:  defect (bug)                         |      Status:  reviewing
 Priority:  normal                               |   Milestone:  Future
                                                 |  Release
Component:  Mail                                 |     Version:  1.5.1.2
 Severity:  normal                               |  Resolution:
 Keywords:  good-first-bug has-test-info has-    |     Focuses:
  patch needs-testing has-unit-tests             |
-------------------------------------------------+-------------------------

Comment (by mosescursor):

 Bug Reproduction  Issue “45516”
 == Reproduction Report
 === Description
 This report validates whether the issue can be reproduced. I have failed
 to reproduce the bug and so couldn't apply patch

 === Environment
 - WordPress: 6.9-alpha-60093-src
 - PHP: 8.2.29
 - Server: nginx/1.29.1
 - Database: mysqli (Server: 8.4.6 / Client: mysqlnd 8.2.29)
 - Browser: Chrome 140.0.0.0
 - OS: macOS
 - Theme: Twenty Twenty-Five 1.3
 - MU Plugins:
   * test-mail.php
 - Plugins:
   * Test Reports 1.2.0
   * WPForms Lite 1.9.7.3
   * WP Mail SMTP 4.6.0

 === Actual Results
 1.  ❌  Error condition does not re-occur (not - reproduced).

 === Additional Notes
 - I set up Docker
 - Installed WordPress trunk using the wordpress-develop environment
 (Docker).
 - Added an MU Plugin to send test emails with MailPit
 - Installed and activated the WP Mail SMTP plugin.
 - Configured SMTP with Mailpit (mailpit:1025).
 - Sent test emails from the WP Mail SMTP tool.
 - Verified messages in Mailpit’s web UI (http://localhost:8025).

 === Supplemental Artifacts

 Plugin Code: This is the code I used in the Plugin (test-mail.php)



 {{{
 <?php
 add_action('init', function() {
     if (isset($_GET['sendmail'])) {
         $to = 'you at example.com';
         $subject = 'Test Email';
         $message = 'Testing reply-to header bug.';

         $headers = [
             'Reply-To: "test2 at gmail.com" <test2 at gmail.com>'
         ];

         wp_mail($to, $subject, $message, $headers);

         echo "Mail sent (check headers).";
         exit;
     }
 });

 }}}


 Received Email headers for test email
 {{{
 From    WordPress Develop  <test at example.com>
 To      <you at example.com>
 Reply-To        "test2 at gmail.com" <test2 at gmail.com>
 Subject Test Email
 Date    Fri, 19 Sep 2025, 11:17 am (620 B)
 Tags
 Add tags...
 }}}


 Email from Blog Post comment


 {{{
 From    WordPress Develop  <test at example.com>
 To      <test at example.com>
 Subject [WordPress Develop] Please moderate: "Hello world!"
 Date    Fri, 19 Sep 2025, 11:38 am (1.2 kB)
 Tags
 Add tags...
 Text
 Headers
 Raw
 Link Check
 A new comment on the post "Hello world!" is waiting for your approval
 http://localhost:8889/?p=1

 Author: Moses Cursor (IP address: 140.82.121.6,
 lb-140-82-121-6-fra.github.com)
 Email: testing at email.com
 URL: https://email.com
 Comment:
 Looks good

 Approve it: http://localhost:8889/wp-admin/comment.php?action=approve&c=2
 #wpbody-content
 Trash it: http://localhost:8889/wp-admin/comment.php?action=trash&c=2
 #wpbody-content
 Spam it: http://localhost:8889/wp-admin/comment.php?action=spam&c=2
 #wpbody-content
 Currently 1 comment is waiting for approval. Please visit the moderation
 panel:
 http://localhost:8889/wp-admin/edit-comments.php?comment_status=moderated
 #wpbody-content
 }}}

-- 
Ticket URL: <https://core.trac.wordpress.org/ticket/49661#comment:19>
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