Keeping senders healthy

Target well. Send to users who expect to hear from you. If health drops to At Risk, message only opted-in users.
Watch your frequency. Respect promotional user limits: 4 messages per sender per 28 days, and never over 3 promotions a day to the same user.
Send steadily. To qualify for an upgrade, send at least 20% of your tier limit across the past 7 days. Senders under 100 messages in 60 days revert to their initial tier.
Do not rotate senders. Creating multiple promotional senders for the same audience leads to shutdown.
React quickly. Negative feedback can arrive late. Check results regularly and adjust content and audience early.
Use test numbers for testing so test traffic does not distort real results.