Mail: Revert Set sender address by default.

This reverts [61010]. Setting the sender address by default has shown to reduce deliverability for emails for sites that were working correctly in 6.8 and before. As reduced deliverability can harm IP reputation which means it's not just the single WordPress install that is harmed, [61010] is being reverted out of an abundance of caution.

Follow up to [61010].

Reviewed by audrasjb, wildworks.
Merges [61537] to the 6.9 branch.

Props jorbin, dmsnell, SirLouen, wildworks, desrosj, siliconforks, digitalblanket, studiomondiale, zoe20, Monarobase, amanandhishoe,
Fixes #64368.See #49687.

Built from https://develop.svn.wordpress.org/branches/6.9@61549


git-svn-id: http://core.svn.wordpress.org/branches/6.9@60860 1a063a9b-81f0-0310-95a4-ce76da25c4cd

Author: aaronjorbin

wp-includes/pluggable.php

@@ -444,7 +444,7 @@ function wp_mail( $to, $subject, $message, $headers = '', $attachments = array()
 		$from_name = apply_filters( 'wp_mail_from_name', $from_name );
 
 		try {
-			$phpmailer->setFrom( $from_email, $from_name );
+			$phpmailer->setFrom( $from_email, $from_name, false );
 		} catch ( PHPMailer\PHPMailer\Exception $e ) {
 			$mail_error_data                             = compact( 'to', 'subject', 'message', 'headers', 'attachments' );
 			$mail_error_data['phpmailer_exception_code'] = $e->getCode();

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.9.1-alpha-61548';
+$wp_version = '6.9.1-alpha-61549';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.