7 Best Email Warmup Tools in 2026 (Boost Deliverability Fast)
Email warmup tools improve deliverability by 30-50% in 2-4 weeks. If your emails land in spam, a warmup tool can fix it. Here are the 7 best options.
⚡ QUICK ANSWER: Best email warmup tools: Warmy (best overall — AI-powered), Mailwarm (best for agencies), Lemwarm (best for cold email), Folderly (enterprise), Warmbox (Gmail), Instantly AI (cold email combo), Manual warmup (free).
7 Best Email Warmup Tools
1. Warmy — Best Overall
Why it ranks #1: AI-powered warmup that adapts to your sending patterns, fastest results (2-3 weeks), and most comprehensive features.
Features:
- AI-driven warmup with adaptive sending
- 200+ warmup emails/day
- Google Postmaster integration
- SPF/DKIM/DMARC setup assistance
- Deliverability monitoring dashboard
- Multi-domain support
Pricing: $64/month (Starter) to $384/month (Business)
2. Mailwarm — Best for Agencies
Features:
- Multi-account warmup (great for agencies)
- Gradual volume increase
- Reply simulation
- Spam folder rescue
- Detailed analytics
Pricing: $49-199/month
3. Lemwarm — Best for Cold Email
Features:
- Built by Lemlist (cold email platform)
- Warmup integrated with cold email sending
- Reply rate optimization
- Spam trigger detection
- Domain reputation monitoring
Pricing: $49/month (add-on to Lemlist)
4. Folderly — Best for Enterprise
Features:
- Enterprise-grade deliverability platform
- Spam test and fix recommendations
- Domain health monitoring
- Bounce rate optimization
- Multi-domain management
- Custom warmup strategies
Pricing: $120-$1,200/month (enterprise)
5. Warmbox — Best for Gmail
Features:
- Specialized for Google Workspace
- Warmup network of 1,000+ mailboxes
- Automatic spam folder rescue
- Reply and engagement simulation
- Simple setup
Pricing: $25-97/month
6. Instantly AI — Best Combined with Cold Email
Features:
- Warmup + cold email in one platform
- Unlimited email accounts
- AI send-time optimization
- Lead database included
- Campaign analytics
Pricing: $37-97/month
7. Manual Warmup — Free
Features:
- Send 5-10 emails/day to trusted contacts
- Ask them to reply and mark important
- Increase volume by 10-20% daily
- Move any spam emails to inbox
- Time-consuming but free
Pricing: $0 (your time)
Feature Comparison
| Tool | AI-Powered | Daily Volume | Multi-Domain | Setup Time | Results In |
|---|---|---|---|---|---|
| Warmy | Yes | 200+ | Yes | 10 min | 2-3 weeks |
| Mailwarm | No | 100+ | Yes | 15 min | 3-4 weeks |
| Lemwarm | No | 100+ | Yes | 10 min | 3-4 weeks |
| Folderly | Yes | Custom | Yes | 30 min | 2-4 weeks |
| Warmbox | No | 50-100 | No | 5 min | 3-5 weeks |
| Instantly AI | Yes | Unlimited | Yes | 10 min | 2-3 weeks |
| Manual | No | 5-20 | No | Ongoing | 4-8 weeks |
Pricing Comparison
| Tool | Entry Price | Pro Price | Enterprise |
|---|---|---|---|
| Manual | $0 | $0 | $0 |
| Warmbox | $25/mo | $97/mo | Custom |
| Instantly AI | $37/mo | $97/mo | $297/mo |
| Mailwarm | $49/mo | $199/mo | Custom |
| Lemwarm | $49/mo | $69/mo | $99/mo |
| Warmy | $64/mo | $144/mo | $384/mo |
| Folderly | $120/mo | $360/mo | $1,200/mo |
Free Email Warmup Strategy
If you cannot afford a warmup tool, here is a free DIY strategy:
Week 1: Foundation
- Set up SPF, DKIM, and DMARC records
- Send 5-10 emails/day to colleagues and friends
- Ask them to reply and mark as important
- Do not send any marketing emails yet
Week 2: Gradual Increase
- Increase to 20-30 emails/day
- Include trusted colleagues in different organizations
- Ask them to reply with 2-3 sentences
- Move any spam emails to inbox and mark not spam
Week 3: Expand
- Increase to 50-80 emails/day
- Start sending to a small segment of your list (50-100 contacts)
- Monitor open rates (target: 30%+)
- Check spam placement with mail-tester.com
Week 4: Full Send
- Increase to 100-200 emails/day
- Begin regular email campaigns
- Monitor deliverability weekly
- Clean list before sending
Free Tools to Help
- Google Postmaster Tools: Monitor domain reputation
- Mail-tester.com: Check spam score
- MXToolbox: Verify SPF/DKIM/DMARC
- Our Subject Line Tester: Avoid spam trigger words
Test your subject lines free →
Email Warmup + Email Platform: The Winning Combo
Warmup tools fix deliverability, but you still need a good email platform. Here is the recommended stack:
- Warm up with Warmy or Instantly AI (2-4 weeks)
- Send campaigns with GetResponse (AI writer, automation, analytics)
- Monitor with Google Postmaster Tools (free)
- Test subject lines with our free tool
Bottom line: Email warmup tools improve deliverability by 30-50% in 2-4 weeks. Warmy is the best overall, while manual warmup works if you have time. Pair your warmup with GetResponse for the best email marketing results. Use our free Subject Line Tester to avoid spam triggers.
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