diff --git src/includes/common/functions.php src/includes/common/functions.php
index 7101e96..51b8a35 100644
--- src/includes/common/functions.php
+++ src/includes/common/functions.php
@@ -1175,6 +1175,11 @@ Login and visit the topic to unsubscribe from these emails.', 'bbpress' ),
 		$headers[] = 'Bcc: ' . get_userdata( $user_id )->user_email;
 	}
 
+	// Make sure someone is receiving an email before sending.
+	if ( 1 === count( $headers ) ) {
+		return false;
+	}
+
 	/** Send it ***************************************************************/
 
 	// Custom headers
@@ -1332,6 +1337,11 @@ Login and visit the topic to unsubscribe from these emails.', 'bbpress' ),
 		$headers[] = 'Bcc: ' . get_userdata( $user_id )->user_email;
 	}
 
+	// Make sure someone is receiving an email before sending.
+	if ( 1 === count( $headers ) ) {
+		return false;
+	}
+
 	/** Send it ***************************************************************/
 
 	// Custom headers