Each user and domain can by default send up to 50 emails per hour or 500 per day. If you need to be able to send a larger amount of email messages per hour, a customized solution can be created for you to meet your needs. Contact email@example.com if you need a customized solution. If you would like to increase your sending limits on a per domain basis, this can be done by purchasing additional SMTP credits. This will allow your domain limits to be increased.