How is a sending domain warmed up before a big list?
First the domain is set up so mail providers can confirm the email really comes from you. Then the list is sent to in stages, warmest contacts first, and the next stage waits until the last one lands cleanly.
Set up first
A domain that has not been authenticated can send for weeks and deliver almost nothing. The fix lives in the domain's own settings, and it comes before any campaign.
Then send in stages
- Start with the people most likely to open.
- Watch how many bounce.
- Move to the next group only when the numbers are clean.
- Pause the moment a stage bounces badly, and find out why.
Why not send it all at once
A new or freshly repaired domain has no reputation yet. One large send to an old list can undo the repair.
Where this comes from
This is how our own team works every day. It is not taken from one client.
Written by RJ Bryan Tres Reyes from our own records and checked by a person. Last reviewed October 13, 2026.
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