Support wp_mail_from hook to set From address.

#48

README.md

@@ -92,6 +92,8 @@ The plugin supports using the `wp_mail_from_name` filter for manually setting a
 [Can I use the Postmark for WordPress plugin with Divi contact forms?](https://postmarkapp.com/support/article/1128-can-i-use-the-postmark-for-wordpress-plugin-with-divi-contact-forms)
 
 ## Changelog
+### v.1.14.0
+* Support using wp_mail_from hook to set From address. Overriding From address via header still has priority.
 
 ### v1.13.4
 * Handle special characters in site titles for test emails.

postmark.php

@@ -3,7 +3,7 @@
  * Plugin Name: Postmark (Official)
  * Plugin URI: https://postmarkapp.com/
  * Description: Overrides wp_mail to send emails through Postmark
- * Version: 1.13.4
+ * Version: 1.14.0
  * Author: Andrew Yates & Matt Gibbs
  */
 
@@ -31,7 +31,7 @@ class Postmark_Mail {
 	 */
 	public function __construct() {
 		if ( ! defined( 'POSTMARK_VERSION' ) ) {
-			define( 'POSTMARK_VERSION', '1.13.4' );
+			define( 'POSTMARK_VERSION', '1.14.0' );
 		}
 
 		if ( ! defined( 'POSTMARK_DIR' ) ) {

readme.txt

@@ -103,6 +103,8 @@ The plugin supports using the `wp_mail_from_name` filter for manually setting a
 1. Postmark WP Plugin Settings screen.
 
 == Changelog ==
+= v.1.14.0 =
+* Support using wp_mail_from hook to set From address. Overriding From address via header still has priority.
 
 = v1.13.4 =
 * Handle special characters in site titles for test emails.

wp-mail.php

@@ -149,9 +149,17 @@ function wp_mail( $to, $subject, $message, $headers = '', $attachments = array()
 	==================================================
 	*/
 
-	// Allow overriding the From address when specified in the headers.
+	// Default From address specified in plugin settings.
 	$from = $settings['sender_address'];
 
+	// Allow overriding the From address when specified via wp_mail_from hook.
+	$from_email = apply_filters( 'wp_mail_from', $from_email );
+
+	if ( isset( $from_email ) ) {
+		$from = $from_email;
+	}
+
+	// Allow overriding the From address when specified via header.
 	if ( isset( $recognized_headers['From'] ) ) {
 		$from = $recognized_headers['From'];
 	}