Front does not have a sending limit, but depending on the type of channel you are sending from, you could run into issues when trying to send a high volume of emails at the same time. For example, there is a rate limit for API-based channels, recipient limit for Gmail channels, etc.

The following resources have more information about sending and rate limits:

• Google's sending limits

• Office 365's sending limits

• Twilio rate limits and message queues

• Recipient limits for each channel type

If you experience issues while mass sending, please look in to your email provider or channel’s sending limits.