Inbox Placement Preflight Checklist

1. Warm Sender Reputation

• Confirm domain warmup is at least 4 weeks with volume ramped gradually.
• Keep daily send counts under your warmup ceiling for the first week of a new play.

2. Authenticate Everything

• SPF, DKIM, and DMARC must be green before launch.
• Align visible From domains with the authenticated sending domain.

3. Clean the List

• Run contacts through verification and remove anything that returns “accept all” or unknown.
• Deduplicate against recent sends so prospects never get two first touches in the same week.

4. Inspect the Templates

• Keep spam-trigger words out (free, guarantee, risk-free, etc.).
• Add a plain-text version that matches the HTML copy one-to-one.

5. Test the Experience

• Send to a seed list that includes multiple mailbox providers.
• Open, click, and reply from test inboxes to show positive engagement signals on day one.