We’re now enforcing the message search rate limit described in the Search messages by date endpoint. If you exceed the limit of 20 searches per minute, we’ll now return a 429 Too Many Requests response code. You can retry your request 60 seconds after you sent the first of the original 20 requests.

You may want to monitor your responses for an increase in 429 codes so that you can change your request system to submit no more than 20 searches per minute if necessary.

We’re enforcing the search request limit to increase system efficiency and minimize overall response time.