Warm Up a New Domain Before Sending at Scale

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Why this matters

Sending large volumes from a new or cold domain before establishing a positive reputation causes immediate throttling and blacklisting that can take months to recover from. A structured warm-up ramp builds trust with inbox providers incrementally so your full volume lands reliably.

Try it yourself

Draft a 30-day warm-up schedule starting at 50 emails on day 1 and doubling every 3 days — calculate the total volume sent by the end of week 4.
During your warm-up's first week, pull only your highest-engagement subscribers (opened in last 30 days) and verify the complaint rate stays below 0.05% per batch.
Monitor Google Postmaster Tools domain reputation daily for the first two weeks and record the date it first reaches the 'High' tier.

References

SendGrid IP Warm-Up Overview