One time payment

One time payments are possible — although all plans require a monthly subscription, you can cancel that subscription at any time. If you only wish to pay for one month, then you can the new plan immediately after paying. No additional changes will then be made.

Sending for only one month will decrease the effectiveness of your campaigns however. Regular sending helps to keep subscribers engaged, and builds up important information about message bounces and list cleanliness. Deliverability is generally improved by sending high quality content at regular intervals due to both the internal scoring and IP allocation of phpList servers and your reputation with recipient email hosting providers.