Starting with a new email domain or IP? You need to warm it up first. Skip this step, and you’ll tank your deliverability before you even start.

What is Email Warm-Up?

Email warm-up is the process of gradually increasing your sending volume to establish a positive sender reputation with email providers (Gmail, Outlook, Yahoo, etc.).

Think of it like building credit:

No history = No trust
Small, consistent activity = Building trust
Sudden large volume = Suspicious behavior

Why Warm-Up Matters

Without Warm-Up

Sending 10,000 emails from a new domain/IP signals:

“This looks like a spammer”
“We’ve never seen this sender before”
“Let’s put this in spam to be safe”

With Proper Warm-Up

Gradually building volume signals:

“This sender is consistent”
“Recipients engage with these emails”
“This is a legitimate sender”

Domain vs. IP Warm-Up

Domain Warm-Up

Your sending domain (yourbrand.com) builds reputation over time:

Linked to authentication (SPF, DKIM, DMARC)
Portable across email providers
Takes 4-8 weeks

IP Warm-Up

Your sending IP address also has reputation:

Specific to your email service provider
Can be shared or dedicated
Takes 2-4 weeks

Best Practice: Warm up both simultaneously.

The Warm-Up Schedule

Week 1: Foundation

Day	Volume	Focus
1	25-50	Internal/test emails
2	50-75	Most engaged subscribers
3	75-100	Top engagers only
4	100-150	Recent openers
5	150-200	30-day actives
6-7	200-300	Monitor & adjust

Week 2: Building

Day	Volume	Focus
8-9	300-500	60-day actives
10-11	500-750	Expand carefully
12-14	750-1,000	Monitor metrics

Week 3-4: Scaling

Increase by 25-50% every 2-3 days
Never more than 2x previous volume
Always monitor engagement

Week 5+: Normal Operations

Continue gradual increases
Maintain consistent sending patterns
Monitor deliverability metrics

Critical Warm-Up Rules

1. Send to Engaged Subscribers First

Your first emails should go to people who:

Opened emails in last 30 days
Clicked recently
Made purchases
Signed up recently

2. Keep Content Clean

During warm-up, avoid:

Aggressive sales language
Multiple CTAs
Heavy images
Spam trigger words

3. Maintain Consistency

Don’t:

Skip days early on
Suddenly increase volume
Change sending patterns dramatically

4. Monitor Closely

Watch these metrics daily:

Bounce rate (keep under 2%)
Spam complaints (keep under 0.1%)
Open rates (should be high with engaged list)
Inbox placement

Signs of Warm-Up Problems

Red Flags

Open rates dropping below 10%
Bounce rates above 5%
Spam complaints above 0.3%
Emails landing in spam

How to Recover

Stop sending immediately
Analyze what went wrong
Reduce volume by 50%
Clean your list aggressively
Resume slowly with best subscribers only

Done-For-You Warm-Up

Warming up an email account properly requires:

Technical expertise
Constant monitoring
Quick problem resolution
Understanding of ESP algorithms

Mailvio’s DFY Warm-Up Service

We handle the entire process:

Setup: Configure authentication, DNS records
Seeding: Generate organic engagement
Scaling: Gradual, monitored volume increase
Monitoring: Daily checks and adjustments
Reporting: Full transparency on progress

Learn more about our warm-up service →

DIY Warm-Up Checklist

If you’re doing it yourself:

DNS records configured (SPF, DKIM, DMARC)
Clean, engaged subscriber list ready
Warm-up schedule planned
Monitoring dashboard set up
Escalation plan for problems
4-8 weeks blocked for warm-up

Calculate Your Warm-Up Timeline

Use our Email Warm-Up Calculator to estimate:

How long your warm-up will take
Daily sending volumes
When you can reach full capacity

Common Mistakes

1. Impatience

“I need to send now!” → Ruined reputation for months

2. Poor List Quality

Warming up with old, unengaged lists guarantees failure.

3. Inconsistency

Missing days or irregular patterns hurt reputation.

4. Ignoring Signals

Not adjusting when metrics show problems.

Next Steps

Questions about warming up your account? Talk to our team.

Email Warm-Up: Everything You Need to Know in 2025