How to Warm Up a New Email Account (Complete 2026 Guide)

What Is Email Warm-Up and Why Does It Matter

When you create a new email account or domain, email providers like Google and Microsoft have no history of your sending behavior. Without a track record, they apply aggressive filtering and may route your emails directly to spam - or reject them entirely.

Email warm-up is the process of gradually building your sending reputation by starting with low volumes of high-engagement emails and increasing volume over time. Done correctly, warm-up establishes you as a legitimate sender before you start cold outreach campaigns.

Skip this step and your cold email campaigns will go to spam from day one.

Step 1: Choose the Right Email Infrastructure

Before warming up, make sure your foundation is correct:

• Use a dedicated cold email domain, not your primary company domain
• Configure SPF, DKIM, and DMARC records on your domain (non-negotiable)
• Choose a reputable email provider (Google Workspace or Microsoft 365 are preferred)
• Set up your email signature, profile photo, and account settings to look human

Step 2: Manual Warm-Up (Week 1)

In the first week, send and receive real emails manually:

• Send 5-10 emails per day to real people you know
• Ask recipients to reply and move your emails out of spam if they land there
• Engage in natural back-and-forth conversations
• Send at random times throughout the day, not in batches

The goal is to signal to email providers that this is a real person sending real emails.

Step 3: Automated Warm-Up Tool (Weeks 2-6)

After week 1, layer in an automated warm-up tool:

• Instantly Warmup
• Lemwarm by Lemlist
• Mailreach
• Warmbox

These tools exchange emails with a network of other warmed-up accounts, simulate real engagement (opens, replies, moving from spam), and gradually increase volume.

Week 2: 15-20 automated warm-up emails per day

Week 3: 25-35 automated warm-up emails per day

Week 4: 35-50 automated warm-up emails per day

Weeks 5-6: 50-75 automated warm-up emails per day

Never turn off warm-up, even during active campaigns. Run it continuously in the background.

Step 4: Start Sending Campaigns Gradually

After 4-6 weeks of warm-up, you can start cold outreach. Start small:

• Week 7: 20-30 cold emails per day
• Week 8: 40-50 cold emails per day
• Week 9+: Scale based on deliverability metrics

• Google Workspace: 50-150 cold emails/day per inbox
• Microsoft 365: 50-200 cold emails/day per inbox

Warning Signs Your Warm-Up Isn't Working

• Open rates below 20% on non-warmed contacts
• Bounces over 3%
• Spam complaints above 0.1%
• Emails landing in promotions tab consistently

If you see these signs, pause campaigns, increase warm-up volume, and check your technical setup before resuming.