It appears you do not already have a license key for MailMate and therefore you will get a license key when starting a subscription. The license key will ensure MailMate runs in “Paid Mode” for at least 3 months.
Note: The subscription system is brand new! Just in case there are any problems, and as a special offer, the initial payment is discounted by 90% until 31 December 2024. In other words, you can get a license key for just $1!
If you stop the subscription payments then your license key will continue to work for you, but MailMate will (eventually) switch into “Free Mode”.
Read more about the license modes on the Pricing page.