Domain warmup is one of the most skipped steps in outbound. Most people set up a domain, connect it to a sequencing tool, and start sending. Within a few weeks the open rates drop, the bounce rate climbs, and emails start going to spam. By that point the domain reputation is already damaged and it takes weeks to repair.
We never skip this step.
Why email providers care about new domains
When a brand new domain starts sending emails, the major email providers have no history to judge it by. No reputation, no sending patterns, no engagement signals. Unknown senders with no track record are treated with suspicion by default.
If a new domain sends high volume immediately, providers flag it as likely spam behaviour. That flag follows the domain and reduces inbox placement across every email sent from it going forward.
Warmup is the process of building that reputation gradually so providers trust the domain before we start sending at full volume.
How we warm your domains
We dedicate the first two to three weeks of every new domain to warmup before any prospect sequences go live.
Here is how the process works:
We configure the domain with the correct technical setup. SPF, DKIM, and DMARC records are all set correctly before any email is sent. These are the authentication signals that email providers check first. If they are missing or misconfigured, inbox placement suffers regardless of how well the domain is warmed.
We start sending at low volume to a network of real, active inboxes that are set up to engage with the emails. Opens, replies, and positive engagement signals build the domain's reputation with providers over time.
We increase volume gradually over the warmup period following a controlled ramp schedule. The pace depends on the provider and the target volume, but we never increase faster than the reputation data supports.
We monitor deliverability signals throughout. If we see any negative indicators we pause and investigate before continuing.
By the end of the warmup period the domain has an established positive reputation and is ready to send at the volumes your campaign requires.
How many domains we set up
We never send your outbound from your primary company domain. That domain carries your brand reputation and should never be exposed to the risk that comes with cold outreach.
Instead we set up dedicated sending domains specifically for outbound. These are typically variations of your main domain, close enough to look professional but separate enough to protect your primary asset.
The number of domains depends on your plan and the volume of outreach we are running. Each domain supports a limited number of inboxes and a safe daily send volume. We cover this in more detail in the Inbox Allocation article.
What happens after warmup
Once a domain is warmed we continue to monitor it throughout the life of the campaign. Sender reputation is not a fixed score. It changes based on engagement rates, bounce rates, spam complaints, and sending patterns.
We track these signals weekly and adjust sending behaviour if anything moves in the wrong direction. If a domain starts showing signs of reputation damage we take action before it affects inbox placement rather than after.
FAQ
How long does domain warmup take?
For most domains the warmup period runs two to three weeks. The exact duration depends on the target send volume and the provider mix we are warming against. We complete warmup before any prospect sequences go live so it never delays your campaign once the other setup steps are done.
What happens if a domain gets flagged despite warmup?
It is rare when the process is followed correctly but it can happen. If a domain gets flagged we pause outreach on that domain immediately, run a full diagnostic, and follow the repair protocol covered in the Spam Recovery article. We do not continue sending from a compromised domain.
Can we use domains we already own?
Yes, as long as they have not been used for outbound before and are not your primary company domain. If you have existing domains you want to use we will check their current reputation before deciding whether to use them or set up fresh ones.