Email Warming
Improve your email deliverability with the automatic warming system.
Email Warming
Email warming is a technique that progressively improves your email account's reputation to maximize the deliverability of your campaigns.
Info Warming is included in the Pro plan.
Important: Gmail Accounts Automated warming is not available for Gmail accounts. Gmail API Terms of Service prohibit automated sending systems that simulate conversations. This feature is available for Outlook/Microsoft 365 and SMTP accounts.
What is warming?
The problem
Email providers (Gmail, Outlook, etc.) monitor sending behavior of accounts:
- An account that suddenly sends many emails is suspicious
- A low engagement rate (opens, replies) hurts reputation
- Too many unread emails can land you in spam
The solution
Warming simulates natural email activity:
- Progressive sending of emails to other accounts in the FluenzR network
- Automatic opening of received emails
- Simulated replies to show engagement
- Removal of emails from spam if necessary
How does it work?
Phase 1: Startup (Week 1-2)
- 5-10 emails/day sent and received
- Automatic opens at 100%
- Some simulated replies
Phase 2: Ramp-up (Week 3-4)
- 15-25 emails/day
- Maintained engagement
- Natural variations in timing
Phase 3: Maintenance (Continuous)
- 20-30 emails/day in the background
- Constant activity to maintain reputation
- Automatic adjustment based on performance
Enable warming
1. Access settings
- Go to Email Accounts
- Click on the account to warm up
- Enable the Warming option
2. Configuration
| Option | Description | Recommendation |
|---|---|---|
| Intensity | Number of warming emails/day | Medium (20/day) |
| Hours | Sending time range | 9am-6pm |
| Days | Days of the week | Mon-Fri |
3. Launch
Click on Start warming. The system starts immediately.
Best practices
When to start warming?
- New account: Start immediately, wait 2 weeks before prospecting
- Existing account: Start and prospect in parallel (reduced volume)
- Account in trouble: Stop campaigns, intensive warming for 1 month
Recommended duration
| Situation | Minimum duration |
|---|---|
| New account | 2-4 weeks |
| Little-used account | 1-2 weeks |
| Deliverability issue | 4-6 weeks |
Warning Do not disable warming during your active campaigns. It maintains your reputation permanently.
Prospecting volume
During warming, limit your prospecting volume:
| Phase | Warming emails | Prospecting emails |
|---|---|---|
| Week 1-2 | 10-20/day | 0-10/day |
| Week 3-4 | 20-30/day | 20-50/day |
| Week 5+ | 20-30/day | 50-100/day |
Monitoring
Health indicators
In the account dashboard, monitor:
- Reputation score: Rating from 0 to 100
- Spam rate: % of emails landing in spam
- Engagement rate: Opens and replies
Alerts
FluenzR alerts you if:
- The reputation score drops significantly
- The spam rate increases
- Technical issues occur
FAQ
Will I see warming emails in my inbox?
No. They are filed in a Warmup folder:
- OVH (Zimbra) mailboxes and Sieve-compatible servers (Purelymail, IONOS, Gandi…): FluenzR adds a rule to your mailbox that files warming emails into Warmup as soon as they arrive. They never go through your inbox and trigger no notification. Your other rules are kept.
- Other mailboxes: FluenzR checks your mailbox a few seconds after each warming email and moves it to Warmup.
Do not delete the Warmup folder or the "FluenzR Warmup" rule: it would be added back automatically.
Is warming detectable?
The FluenzR warming network uses real email accounts with varied behaviors. The activity looks like normal professional exchanges.
How long does it take?
- Visible effect: 1-2 weeks
- Established reputation: 4-6 weeks
- Maintenance: Continuous
Can I prospect during warming?
Yes, but reduce volume in the first weeks. Warming and prospecting complement each other.
What happens if I stop warming?
The account's reputation gradually degrades without positive activity. Keep warming active as long as you're prospecting.
Which account types support warming?
Warming works with Outlook/Microsoft 365 and SMTP accounts.
Gmail is not compatible with warming due to Gmail API Terms of Service. For Gmail accounts, see our guide on natural reputation building.
Troubleshooting
"Warming inactive"
- Check that the account is properly connected
- Reconnect the account if necessary
- Contact support if the problem persists
Declining reputation score
- Check your ongoing campaigns
- Reduce prospecting volume
- Increase warming intensity
- Wait 1-2 weeks
Emails still in spam
- Warming takes time (4-6 weeks minimum)
- Check your DNS configuration (SPF, DKIM, DMARC)
- Improve your email content
- Use fewer links and images