Introduces a new hook after an email is sent

Closes #24641

includes/emails/class-wc-email.php

@@ -658,6 +658,16 @@ class WC_Email extends WC_Settings_API {
 		remove_filter( 'wp_mail_from_name', array( $this, 'get_from_name' ) );
 		remove_filter( 'wp_mail_content_type', array( $this, 'get_content_type' ) );
 
+		$id = $this->id ? $this->id : 'default';
+		/**
+		 * Action hook fired when an email is sent.
+		 *
+		 * @since 5.5.0
+		 * @param bool $return Whether the email was sent successfully.
+		 * @param WC_Email $this WC_Email instance.
+		 */
+		do_action( 'woocommerce_email_' . $id . '_sent', $return, $this );
+
 		return $return;
 	}