English: Message Stream ID is <strong>optional</strong>. By default <strong>outbound</strong> (Default Transactional Stream) will be used. More information can be found in our <a href="%s" target="_blank" rel="noopener noreferrer">Postmark documentation</a>.
Dutch: Message Stream ID is <strong>optioneel</strong>. Standaard wordt <strong>outbound</strong> (Standaard Transactionele Stream) gebruikt. Meer informatie is te vinden in onze <a href="%s" target="_blank" rel="noopener noreferrer">Postmark documentatie</a>.