Can I reset or adjust the number of recipients that can be emailed in 24 hours?

Hi there,

Our site uses this plugin, and we’re having a problem as we are getting the following message:

User has exceeded its 24-hour sending limit. Messages to 250 recipients out of 250 allowed have been sent. Relay quota will reset in 9.56 hours.

Is there a way to reset this quota or to change it so we can send out more emails?

Thank you for your help ??