You just set up a new domain for cold email. Now you're staring at it, wondering how long you actually have to wait before you can send to real prospects without destroying your reputation.

Here's the frustration: everyone tells you to "warm up your domain," but nobody tells you what that actually looks like day by day. You don't know if you're doing enough, too much, or if your warmup is even working. So you either send too aggressively and blow up your deliverability, or you wait too long and waste two months before seeing any results.

This is a week-by-week breakdown of what actually happens during domain warmup, what you should be doing each week, and what results you should expect. This is based on real data from domains that landed in inboxes and domains that got blacklisted.

Week 1: Foundation Phase (Send to Warm Contacts Only)

Your domain has zero reputation. ISPs have never seen it before. Your job this week is to establish that you're a real person sending real emails - not a spammer.

During week 1, you should only be sending to warm contacts - people who know you, have interacted with you before, or explicitly asked to hear from you. Think: past clients, LinkedIn connections who engaged with your posts, webinar attendees, email list subscribers.

Send volume: 5-15 emails per day maximum. That sounds low, but your domain is brand new. You're not trying to hit numbers. You're trying to build trust signals with ISPs.

What you're actually doing: Sending emails that will get high engagement rates (opens, clicks, replies). ISPs watch engagement. High engagement = good signal that this is legitimate mail.

Example email to warm contact:

Hi [Name], I just launched a new project helping [type of business] with [specific outcome]. Thought of you immediately. Would love to grab 15 min next week and get your take on something. [Your name]

Expected results: You should see 30-40% open rates and a few replies. That's the baseline that proves these are legitimate emails to real people.

Week 2: Gradual Expansion (Warm + Lukewarm Contacts)

Your domain has a tiny bit of history now. You have a few days of sends with decent engagement. ISPs are starting to recognize the pattern - real person, real mail.

Now you can expand slightly. Start mixing in lukewarm contacts - people you haven't talked to in a while, second-degree connections, cold prospects from your ideal customer profile who have some light touchpoint with you (viewed your profile, opened a cold email before, etc.).

Send volume: 15-30 emails per day. You're doubling down, but still conservative. You're not blasting 100 emails on day 8.

What changes: You're introducing some cold email copy now, but it should still be relatively personalized. You're testing the ISPs' willingness to deliver emails from your domain to people they don't recognize.

Example approach: 20 emails to warm contacts, 10 emails to new prospects. Keep the warm stuff going because that engagement is protecting your reputation.

Expected results: Opens should drop slightly (cold prospects have lower open rates), but you should still be in the 20-25% range. If you drop below 15%, stop and reassess - something's wrong with your copy or your list quality.

Week 3: The Critical Test Phase

This is where most people either succeed or fail with domain warmup. You've proven you're real, but now you're scaling to actual cold outreach. ISPs are watching to see if you stay legitimate at higher volume.

Send volume: 30-50 emails per day. This is still not aggressive, but it's noticeably more than week 2.

What matters: Your list quality becomes critical here. If you're sending to bought lists, scraped emails, or low-quality prospects, this is when spam complaints start hitting. Even one spam complaint per 1000 sends will start hurting your reputation.

Maintain your warm sends too. Don't go all-in on cold. The ratio should be roughly 60% cold, 40% warm. Those warm contacts keep your engagement metrics healthy while you test cold outreach at scale.

Example send mix: 30 cold emails to prospects + 20 emails to warm contacts = 50 total per day.

Expected results: Cold open rates should be 15-20%. You might see 2-5 replies from cold outreach. That's normal. The key metric isn't replies yet - it's deliverability. Check your bounce rate (should be under 5%) and spam complaint rate (should be near zero). If bounces are high, your list is bad. If complaints are coming in, your copy is too aggressive.

Week 4: Stability and Scale Decision

You've made it through the riskiest phase. Your domain has four weeks of history. ISPs have seen enough data to make a judgment: this looks legitimate.

Send volume: 50-75 emails per day. You can increase, but do it gradually. A jump from 50 to 150 on day 22 will trigger spam filters.

What to monitor: Check your domain reputation on tools like Google Postmaster Tools, Barracuda, or similar. You should see a green or neutral status. If it's red, slow down and investigate why.

This is also when you decide if you need another domain. If your open rates are holding steady at 15%+ and you want to send 200+ emails per day, you'll need a second domain to avoid throttling.

Expected results: By the end of week 4, you should have 5-15 replies from cold outreach (assuming your copy is solid). Open rates should be stable at 15-20%. Bounce and complaint rates should be consistently low.

Weeks 5-8: Optimizing, Not Warming

Your domain warmup is done. You can now send 100-200+ emails per day from this domain without warmup concerns. From here, improvement comes from better copy, better targeting, and better follow-up sequences - not from warming.

If you want to scale beyond 200/day per domain, add a second domain and repeat this process. But don't try to squeeze more volume out of a single domain just by sending more emails. You'll hit deliverability issues.

Common Mistakes During Warmup

Mistake 1: Sending to bad lists immediately. If your first 100 emails bounce, ISPs notice. A domain can get blacklisted in week 2 if your list quality is terrible. Verify emails before sending. Use a tool like ZeroBounce or Hunter to catch invalid addresses.

Mistake 2: Not maintaining warm engagement. People stop emailing warm contacts because they want to focus on cold outreach. This tanks your open rates and kills the engagement signals ISPs rely on. Keep those warm emails going through week 4 minimum.

Mistake 3: Jumping to 100+ emails too fast. Impatience kills domains. Your domain doesn't care if you're excited. It needs to earn trust gradually. Slow ramp = better deliverability long-term.

Mistake 4: Using a catch-all email address during warmup. ISPs trust verified email addresses more than catch-alls. If possible, create real mailboxes during warmup, then you can move to a catch-all in week 4-5.

The Gap Between Knowing This and Actually Running It

Reading this, you now know the timeline and what to expect. But executing it cleanly is different. You need to manage warm contact lists, monitor ISP reputation daily, adjust send volume based on metrics, handle replies, track engagement by list segment, and know when to add a second domain.

Most people either skip warmup entirely (domain dies in week 2) or do it halfheartedly (domain limps along at 8% open rates). The gap between "knowing the framework" and "having this running at scale with good results" is execution and attention to detail - especially during weeks 2-4 when small mistakes compound.

If you want to do this yourself, it's doable. If you want someone handling the warmup, list management, monitoring, and optimization while you focus on other parts of your business, that's the kind of thing we do at BEC Growth. We own the entire setup and execution, so your domain is properly warmed and your campaigns actually get replies.

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