Introduction: The Critical First Month

If an enterprise buys a new Dedicated IP for their transactional emails (like receipts and password resets), the first 30 days dictate the success or failure of that IP for years to come. A bad warm-up can cause permanent deliverability damage.

The 5 Golden Rules

  1. Start Very Small: Begin with fewer than 50 emails a day. Double the volume every 3 days.
  2. Target the Engaged: Only send the initial emails to your best, most active users who you know will definitely open them.
  3. Pace the Connections: Don't open 1,000 parallel connections to Gmail. Send the emails slowly, one by one.
  4. Monitor the Blocks: If you see a '421' temporary block from Yahoo, immediately stop sending for 24 hours. They are testing you.
  5. Lock Down Auth: Ensure SPF, DKIM, and DMARC are perfectly aligned *before* sending the first test email.

Conclusion

IP warming requires discipline. Treating a new IP address with extreme care ensures it will reliably deliver millions of messages in the future. Audit your IP authorization here.