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Are there rate limits on sending emails using the transactional API? 

Hi @kchro3 

The transactional API is optimized to send transactional messages to one recipient at a time (ie order confirmations), and should not be used to send marketing blasts. They have a limit of 15 total recipients across To and BCC fields, a higher rate limit of 100 requests/second, and also have dedicated sending lanes to ensure a quick delivery.

I hope this clarifies!


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