Mailtrack doesn't set its own limit on how many tracked emails you send. Campaigns can go to up to 10,000 recipients at a time with the Mailsuite plan. Learn more in Campaigns: Are there any send limits or restrictions?
The maximum number of emails you can send depends on the limits Google has set for your Gmail account. Check your sending limits with Google.
Please note that if Google detects potentially suspicious activity, such as suspected spam, violations of its terms of service or high bounce rates, it may block your emails even if you haven't reached the official limits. Google doesn't specify the exact reasons for these actions, and unfortunately we can't intervene from Mailtrack.
Mailtrack uses Gmail's own sending service to give you the best deliverability. For this reason, if you run into any issues with sending limits, you'll need to contact Google to resolve them.