Note — The limit depends on your plan
Starter includes 500 marketing sends a month, Pro 2,000, and Enterprise has no limit. During the trial period Starter’s limits apply, whatever plan you choose when signing up. A banner on the Campaigns tab always shows how much you have left — for example “You have 2000 of 2000 marketing sends left this month”.
Today, sending a campaign is always immediate once confirmed; scheduling a campaign for later isn’t available yet.