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Domain & IP Warm-up Guide

When sending from a newly registered domain or a fresh dedicated IP, destination mailbox providers have no historical data to evaluate whether you are a legitimate business or a spammer. Gradually warming up your sending volume establishes a positive reputation and ensures consistent inbox placement.

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4-Week Warm-up Schedule

If you have an audience of 50,000+ subscribers, distribute your sends over 4 weeks:

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Tips for a Successful Warm-up

  1. Start with High-Engagement Traffic: Begin with transactional emails (password resets, order receipts, sign-up confirmations). These emails have the highest open rates (~60–80%) and generate positive reputation signals.
  2. Monitor Bounce and Complaint Metrics Daily:
    • Keep hard bounces below 2%.
    • Keep spam complaints below 0.1% (never exceed 0.3%).
  3. Do Not Skip Days Abruptly: Senders that send 50,000 emails on Monday and zero for the rest of the week look suspicious to ISP spam filters. Distribute volume evenly across days.