The sending quota exceeded error happens due to:
- Emails sent in short succession or bursts
- Large number of leads per day, going past the 50 "IN TOTAL" mails (outbound + warmup)
- Copy that is being flagged as repeat copy, fix is using spintax and AB testing
- Being reported for spam
Easy ways to fix this:
- Have a minimum time gap of atleast 5 mins
- Reduce the max emails + warmup to be 50, use the smart adjust feature
- Wait 24 hours, it'll automatically fix this
- Beyond lead validation, ensure your ICP is also right
- Move to oAuth if you haven't yet already