Hi @Chetan_Modi,
Our rate limit is based off of the number of recipients (not the number of Retool email queries)
Paying users can send up to 120 Retool Emails per hour while free users can send up to 50 Retool Emails per day. That error indicates you're hitting the limit. How often is that happening? What would you need for your use case? Retool email resource running into error: Invalid login: 451 Internal server error - #2 by Alice