Cold Email Week 4 Results Guide: What to Look For and How to Fix What's Broken

By week 4 of a cold email campaign, you should have enough data to know if something is working or if you're throwing emails into the void. But most people don't know what to actually measure - they're just staring at their inbox wondering why replies aren't coming in.

This guide shows you exactly what metrics matter in week 4, what the actual benchmarks are, and what to do when something isn't hitting.

What You Should Have by Week 4

If you've been running a proper campaign (sending 50-100 emails per day across your domain rotation, following reasonable sending limits), you should have roughly 300-500 emails in the market by day 28.

That's enough volume to see patterns. Not enough to declare victory, but enough to know if you're on the right track or if something fundamental is broken.

Week 4 is also when you're hitting the end of your first sequence. Most people run 4-5 touchpoints over 21 days, so by day 28 you're either in your last email or wrapping up the first round. This is the moment to measure what actually landed.

The Three Numbers That Actually Matter in Week 4

1. Deliverability Rate (Are Your Emails Getting There?)

This is the foundation. If your emails aren't landing in inboxes, nothing else matters.

In week 4, you should be seeing a deliverability rate of 92-97%. Anything below 90% means you have a problem with your infrastructure, domain reputation, or list quality.

Check your email provider's bounce report. You're looking for:

Hard bounces (invalid addresses, domain doesn't exist): Should be under 2% of your send volume
Soft bounces (mailbox full, server issues): Should be under 1%
Spam/block rate: Should be nearly 0% - if you're hitting 3%+ consistently, you have a sender reputation problem

If your bounce rates are high, you likely have bad list data. Run a proper list cleaning process before sending your next batch.

2. Open Rate (Are People Seeing This?)

Open rates are flaky - email clients don't always load images, Apple Mail hides opens - but they still give you a rough signal.

In week 4, a decent cold email campaign should see open rates between 25-35%. If you're below 20%, your subject lines aren't working or you're going to the wrong people.

The easiest win here is testing subject line structure. Instead of cute subject lines, try:

Question for you: [prospect's company]'s [specific thing] - is [problem] happening on your end?

This structure works because it uses specificity (their company name, their industry detail) and invokes curiosity without being manipulative. We've seen this format hit 32-38% open rates across different industries.

3. Reply Rate (Is Anyone Actually Interested?)

This is the only metric that matters in the end. By week 4, you should have a baseline reply rate.

For service businesses and agencies running B2B cold email, here are actual benchmarks:

3-5% reply rate = You're in good shape. Scale this.
2-3% reply rate = Decent. It works, but there's room to improve copy and targeting.
1-2% reply rate = Below average. Your offer or targeting needs work.
Below 1% = Something is fundamentally wrong. Either your targeting is off, your copy is generic, or your offer isn't compelling.

Count every reply - yes replies, no replies, objections, unrelated questions. They all count as engagement. Week 4 is too early to filter for "qualified" replies only.

Diagnosing What's Wrong

Low Open Rates + Good Deliverability = Subject Line Problem

Your emails are landing, but people aren't opening. Test 3-5 different subject line angles in week 5.

Instead of:

Quick question about [company]

Try:

[Prospect name] - [specific metric] question

The second version has a name call-out and specificity. It gets higher open rates because it feels less like a template blast.

Good Open Rates + Low Reply Rates = Copy or Offer Problem

People are reading your email but not replying. Either:

Your email is too long (keep it to 4-5 sentences max)
Your ask is too big (don't ask for a 30-minute call in the first email)
Your offer isn't clear (what exactly are you offering to help with?)

The fix: Shorten your email, make the ask smaller (ask for their thoughts, not their calendar), and be explicit about what you do.

Low Deliverability = Infrastructure or List Problem

Emails aren't landing. Check:

Are your SPF/DKIM/DMARC records set up correctly? (Most people skip this.)
Is your domain warming up gradually? (Sending 500 emails on day 1 from a new domain tanks reputation.)
Is your list full of bad data? (Low-quality leads = bounces = reputation damage)

If this is your issue, fix your infrastructure setup before running more volume.

The Week 4 Decision Point

By the end of week 4, you need to make one of three decisions:

Scale it: If you hit 3%+ reply rate and deliverability is solid, increase your sending volume by 50%. You've found something that works.
Fix and test: If you're at 1-3% reply rate, identify the one variable that's underperforming and test a change in week 5. Change one thing - subject lines, opening line, or call-to-action. Don't change everything at once.
Restart: If you're under 1% reply rate and below 90% deliverability, you have fundamental problems. Pause, fix your infrastructure and list quality, and start fresh.

Don't waste week 5 being confused about what's working. Know your three metrics, benchmark them, and take action.