The number of subscribers you can have for your newsletter depends on your plan and how often you are sending your newsletter.
- The free plan allows 10,000 monthly messages.
- The standard plan allows 20,000 monthly messages.
- The pro plan allows 45,000 monthly messages.
Therefore if you have 1,000 subscribers, you could send 10 times a month, but if you wanted to send more than 10 times a month then you would want to upgrade your plan.
Subscribers are only contacts that are receiving your newsletter therefore you may have 1,500 contacts but if 500 are unsubscribed then you only have 1,000 subscribers.