Reducing mailbox bounce rate after a deliverability issue

If your mail starts getting flagged, work through this list:

1. Confirm SPF + DKIM + DMARC are all green in cPanel's Email Deliverability.
2. Check your DMARC rua reports for failing sources. Often a forgotten marketing tool.
3. Verify the sending IP isn't on a blocklist via MXToolbox.
4. If you've just sent a large campaign, slow your send rate. Hosting outbound is rate-limited to 50/hour per plan.