Mailmeteor quota varies depending on the type of your Google account (G Suite or Gmail) and your plan:
100 emails / day
Gmail & G Suite
500 emails / day
1500 emails / day
Your quota is reset 24 hours after the latest campaign. This 24 hours period works on a rolling basis. So, if you send emails at 2PM on Monday, your quota will be reset at 2PM the following Tuesday.
Each time you send emails, we double check that you still have enough quota. If you are trying to send more emails than available, a warning will be shown and your emails will not be sent (see Error insufficient quota).
With the free version of Mailmeteor, you can send up to 100 emails a day. It's twice more free quota than other mail merge solutions. If you want to send more emails, you can upgrade anytime.
The daily sending limits described here are imposed by Google to prevent spam and keep accounts safe. Mailmeteor abides by these limits and allows you to send as much emails as you can using your own Gmail account:
G Suite accounts have a limit of 1,500 recipients per day;
Regular Gmail accounts have a limit of 500 recipients per day.
Check out the dedicated help section about quota.