Email Limits

Quickmail limits the number of initial emails sent per day depending on the account subscription: 

Basic accounts - 200 initial emails per day
Pro accounts - 500 initial emails per day (for the whole account not for each email account)

These limits were set in place to protect the system from abuse by spammers

Follow-up emails don't count against the daily initial email limit, however, Google limits will still apply. Refer to this link for additional information about Google's limits: https://support.google.com/a/answer/166852?hl=en