Warming up email accounts is non-negotiable for deliverability. Here's exactly how to do it.
What is Email Warm-Up?
Gradually increasing email volume and building positive engagement signals to establish sender reputation with email providers.
Why It Matters
New domains/accounts have no reputation. Email providers are suspicious of new senders. Jumping to high volume triggers spam filters.
Manual Warm-Up Process
Week 1: 10-20 emails/day to engaged contacts (colleagues, friends, customers who'll respond).
Week 2: 30-50 emails/day. Start adding some cold prospects, prioritize likely responders.
Week 3: 75-100 emails/day. Mix of warm and cold.
Week 4+: Gradual increase (20% per week) toward target volume.
Best Practices
Send to engaged contacts who'll respond. Aim for positive engagement (replies, non-spam). Maintain consistent daily patterns. Mix promotional with conversational. Avoid spam trigger words.
Automated Warm-Up Tools
Warmbox, Lemwarm, Mailwarm: Simulate real email activity, build positive engagement signals, monitor inbox placement.
Warning Signs
Sudden deliverability drops. Increase in bounces. Lower open rates than expected.
If problems occur: Reduce volume immediately, diagnose issues, fix and restart warm-up slowly.
Ongoing Maintenance
Even established accounts benefit from consistent sending patterns, some warm traffic mixed with cold, and regular engagement signals.