You got Sending rate exceeded or Daily sending quota reached. This is the email system’s account cap, not your Lumail plan’s monthly limit.
- Throttling — too many sends per second. Transient. Slow down; Lumail will retry eligible mail.
- Daily quota — the 24-hour send ceiling was hit. Wait for the window to roll, or ask for a higher cap.
What to change
- Stop launching another full-list campaign on top of one already draining the quota.
- Let in-flight retries finish. Don’t hammer “Send” on the same campaign.
- If this is normal volume for you, email [email protected] with the org slug and approximate daily volume. We raise the provider cap; you cannot do it in DNS.
- If you also see monthly Lumail limit alerts, that’s a different ceiling — How to fix a monthly email limit.