You can define how many mails Mailster send in a certain period so you can respect your providers limits

Use this form to calculate your settings:

I can send mails within hours

My cron interval is minutes

Your limits are

Send max 34 emails at once and max 10000 within 24 hours

A campaign with subscribers will take approx. 02:36 h to get finished

Sending more than 200 at once can cause server timeouts!
You should decrease the cron interval!