We’ve released a fix for the “too many requests” errors caused by too many recipients in an email campaign list. This error is caused by exceeding the “limit” of how many recipients can be sent to SendGrid through their APIs at one time. We have built a queue on the backend to HOLD the lists and send them in smaller groups in order to prevent the API from failing. This means you will see a new message once you click “Complete & Save” after populating your list:
“Loading email list. Please be patient…”
PLEASE NOTE: The “wait” time for the list will depend on how many email lists are being generated simultaneously.