Domain warmup
Domain warmup is raising the volume sent from a new domain gradually over weeks, so receiving providers build a record of it behaving well before it sends at full rate.
Also called Email warmup, IP warmup.
Domain warmup is the practice of raising sending volume from a new domain slowly, over weeks, instead of starting at the rate you eventually want. Email warmup is the same practice under a more common name, and what gets warmed is the domain and the IP the mail leaves from rather than any one mailbox. It exists because a receiving provider has no history for a new domain and treats absence of history as risk. A domain that has never sent anything and then sends a thousand emails in a day looks exactly like a domain bought that morning for spam, because that is very often what it is.
A warmup starts at a handful of messages a day and roughly doubles each few days, with the ramp paused whenever bounce or complaint rates move. What is being built is not a volume allowance but a record: authenticated mail, sent to addresses that exist, to people who open and reply and do not complain. Engagement is the part that matters most, which is why warming up by sending to addresses that will never reply achieves very little.
Two practical notes. Warmup applies per sending domain and per IP, so moving to a new domain or a new provider means starting again. And a subdomain inherits some but not all of the parent domain's standing, which is why sending outreach from a subdomain is a common way to protect the reputation of the domain your actual business email runs on.
In practice
- Twenty emails a day in week one, forty in week two, eighty in week three, pausing whenever complaints rise.
- Sending outreach from mail.example.com rather than example.com, so a bad campaign cannot damage the domain your invoices come from.
- Starting over from a low rate after switching sending providers, because the new IP has no history.
Questions
How long does warming up a domain take?
Three to six weeks to reach a normal outreach volume, longer if you want high volume. The ramp is bounded by how fast providers accumulate evidence rather than by anything you control, so the process cannot be shortened by sending more. It can easily be lengthened by sending too much and having to back off.
Do warmup services that exchange opens actually work?
Partly, and less than they claim. Networks where seed accounts open and reply to each other's mail do generate engagement signals, but the engagement is not from real prospects and providers have got better at recognising the pattern. It builds some history; it does not substitute for sending relevant mail that real people answer.
Should I use a separate domain for outreach?
Usually yes. Outreach carries a risk of complaints that ordinary business mail does not, and a damaged domain affects everything sent from it, including invoices, password resets and replies to customers. A separate domain or subdomain contains that risk. The trade-off is that it starts with no reputation and has to be warmed.
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