Emails are bouncing

• Check the risk grade. Emails come back with a risk grade. Grade A is safest. Consider skipping C and D addresses in your sends.
• Verify before big sends. POST /v1/emails/verify costs 0.1 credit per address.
• Use flows, not blasts. Send one relevant message tied to what the person did, not your whole campaign calendar.
• Warm up. Start with a small daily volume and grow it over a few weeks.
• Honor unsubscribes immediately, and suppress people who complain.

If a specific address we returned bounced, tell support and include it so we can review the source.