When your email quota is reached you have no more email credits, so remaining scheduled emails for the current month can not be sent.
We recommend to upgrade for a plan that fits your needs (Pro plans include unlimited email reminders) before you reach your limit.

Emails* will be sent again when your quota is reset.
* emails scheduled in the future, not unsent emails from previous month.

If you don’t want to lose potential attendees, you can download email addresses of visitors who scheduled a reminder in your “Email” section. So, you can send reminders by yourself through any email marketing platform.