The process of gradually increasing sending volume on a new domain or IP, so mailbox providers build trust in it over time.
What Is Email Warm-up?
A brand new sending domain has no reputation yet, good or bad. Warm-up is the process of sending small, increasing volumes over a few weeks instead of blasting your full list on day one, giving inboxes a chance to learn you’re a legitimate sender.
Why Warm-up Matters
Email marketing depends entirely on trust that hasn’t been built yet on a new domain. Skip warm-up, and a sudden spike in volume looks identical to spam behavior from an inbox’s point of view, regardless of how good your list actually is.
This shows up most often when switching email platforms or launching a new sending domain for a growing store.
How Warm-up Works
1. Start with your most engaged segment, customers who open and click regularly
2. Send small volumes for the first several days
3. Gradually increase volume over two to four weeks
4. Expand to your broader list only once engagement stays steady at each step
A Sample Warm-up Schedule
| Week | Daily Volume | Audience |
|---|---|---|
|
Week 1
|
50 to 100 emails
|
Most engaged customers only
|
|
Week 2
|
200 to 500 emails
|
Engaged customers, expanding slightly
|
|
Week 3
|
1,000 to 2,000 emails
|
Broader active list
|
|
Week 4+
|
Full list
|
Full list, monitoring closely
|
Exact numbers depend on your total list size, this is a general shape to follow, not a fixed rule.
How Adflipr Helps
Adflipr’s segmentation tools make it easy to start warm-up with your most engaged customers specifically, without manually pulling that list yourself, and campaign scheduling lets you space out volume increases automatically over the warm-up period.
Best Practices
– Always start with your most engaged segment, not a random sample
– Increase volume gradually, doubling roughly each week is a reasonable pace
– Watch engagement and bounce rate at each step before increasing further
– Warm up again after any major platform switch, even with an established list
Common Mistakes
– Sending full list volume immediately after connecting a new domain
– Warming up with your oldest, least engaged contacts instead of your most active ones
– Rushing the schedule to hit a launch date instead of watching engagement signals
– Assuming warm-up is only needed once, and skipping it after a platform switch
Frequently Asked Questions
Typically two to four weeks, depending on your list size and how gradually you increase volume. Larger lists generally need a longer, more careful ramp-up.
Inboxes read the sudden spike as suspicious behavior, similar to a spam pattern, which can tank inbox placement right from the start and take weeks to recover from.
Yes, if the new platform uses a different sending domain or IP, it starts with no reputation of its own, regardless of how established your list or old domain was.
Yes, and you should, starting with your most engaged segment specifically. A warm-up built on active, responsive subscribers signals trust to inboxes much faster than a random slice of your full list.
