I'll give you the exact warmup settings we use at imisofts. No guesswork, no theory. These are the configurations that maintain 91-97% inbox placement across 250+ inboxes.
The 14-Day Warmup Schedule
This is our standard protocol. We never deviate.
Days 1-2: Trust-Building Phase
- Sends: 5-10 per day
- Recipients: Warm contacts only (existing customers, warm leads)
- Reply rate target: 40%+ (this trains Google's algorithms that people want your emails)
- Engagement: Leave emails in inbox, don't delete or archive
- Action: Only send, don't automate replies yet
Days 3-4: Gentle Scaling
- Sends: 15-25 per day
- Recipients: 50% warm, 50% cold but high-intent
- Reply rate target: 30%+
- Engagement: Same—leave emails visible
- Action: Start light reply automation if replies exceed 50 per day
Days 5-7: Moderate Escalation
- Sends: 30-50 per day
- Recipients: 30% warm, 70% cold
- Reply rate target: 15%+
- Engagement: Now you can create folders, but don't auto-archive
- Action: Automation now acceptable
Days 8-10: Building Authority
- Sends: 50-100 per day
- Recipients: 20% warm, 80% cold (best-fit list)
- Reply rate target: 8%+
- Engagement: Normal operations
- Action: Full automation safe
Days 11-14: Pre-Launch
- Sends: 100-200 per day
- Recipients: Best-fit cold list (10% warm, 90% cold)
- Reply rate target: 5%+
- Engagement: Normal
- Action: Ready for production campaigns
Day 15+: Production
- Sends: 200-500 per day (depends on daily limits)
- Recipients: Pure cold outreach
- Reply rate target: 3%+
- Engagement: Normal operations
Daily Send Limits (Per Inbox)
This matters more than most people realize. Gmail monitors send velocity, and if you suddenly spike, you trigger manual review flags.
Our Configuration:
- Micro accounts: 25/day
- Small accounts: 50/day
- Starter accounts: 100/day
- Professional accounts: 200/day
- Enterprise accounts: 250-500/day (domain dependent)
These are hard caps. We never exceed them by more than 5%. The goal is consistency—Gmail prefers predictable senders to erratic ones.
Pro Tip: If you run multiple campaigns from one inbox, total daily sends should never exceed your daily limit. So if your limit is 100, and Campaign A sends 60, Campaign B gets 40 max.
Volume Ramp Schedule (First 30 Days)
Here's how we structure ramping beyond the initial 14 days:
- Days 1-7: 50 sends/day max
- Days 8-14: 100 sends/day max
- Days 15-21: 150 sends/day max
- Days 22-30: 200 sends/day max
- Day 31+: 250-500/day (based on domain history)
This prevents Gmail's algorithms from flagging sudden changes in sender behavior. Gradual increase = safe.
Warmup Settings in Instantly Interface
In Instantly, navigate to Settings > Inbox Settings > Warmup Configuration.
Enable Warmup: YES
Warmup Type: Authentic
Daily Warmup Sends: 10-15 (Instantly will send warm emails to engaged contacts)
Warmup Duration: 14 days
Pause Campaigns During Warmup: NO (you can run campaigns—just keep volumes low)
Once warmup completes, Instantly automatically transitions to production sending. Don't manually override this.
When to Adjust Settings
Increase daily limits if:
- 7 consecutive days with 0% spam complaints
- Bounce rate stays below 3%
- Reply rate stays above 5%
Decrease daily limits if:
- Spam complaint rate exceeds 0.5%
- Bounce rate exceeds 5%
- Any email lands in spam folder (check Google Postmaster Tools)
Pause everything if:
- Spam complaints exceed 1%
- Inbox placement drops below 70% (check Postmaster)
- Multiple emails land in spam in a single day
Reply Engagement Rules
Google tracks how recipients engage with your emails. If warmup emails get 60% open rate but only 20% reply rate, Google knows something's off.
During warmup, ensure:
- Warmup emails are real replies (not auto-responses)
- Recipients should reply naturally
- Your warmup list should be people who'll actually engage
- Test by sending to your own email first, verify you receive it inbox
If recipients aren't replying to warmup emails, your list is bad. Pause warmup and fix your recipient list before continuing.
Common Mistakes We See
Mistake 1: Skipping warmup entirely. I see this constantly. Agencies think their domain "looks warm" and skip the process. This accounts for 40% of our client onboarding issues. Never skip warmup. Ever.
Mistake 2: Exceeding daily limits by "just 10%." Gmail's algorithms are sensitive to incremental violations. If your limit is 100, sending 110 is the same as sending 200 in Gmail's eyes—it triggers review. Respect the limits exactly.
Mistake 3: Using warmup email lists with no engagement. If your warmup list is filled with invalid emails or non-responsive people, you're signaling to Gmail that you're a spammer. Your warmup list should be people you know will respond.
Mistake 4: Checking inbox placement during warmup. Warmup is 14 days. Your emails will fluctuate during this period. Don't panic if placement drops to 60% on day 5. By day 14, it should be 90%+. Trust the process.
Mistake 5: Running multiple unrelated campaigns on one warmup. If you warmup an inbox for SaaS outreach, then switch to real estate, Gmail sees conflicting signals. One domain = one industry during warmup.
Domain Reputation Check
Before starting warmup, verify your domain has zero history. Use these tools:
Google Postmaster Tools (postmaster.google.com):
- Check historical spam complaints (should be 0)
- Verify authentication (SPF, DKIM, DMARC all GREEN)
- Domain reputation should show as "Not in a bad reputation"
MXToolbox (mxtoolbox.com):
- Check DNSBL listings (should be clean)
- Verify blacklist status (BarracudaCentral, SpamCop, etc.)
If your domain shows any blacklist history, start with a different domain. You can't recover a poisoned domain in 14 days.
Final Checklist Before Production
Before you hit production sending at 250+/day, verify:
- ✓ 14-day warmup completed
- ✓ Zero spam complaints (check Postmaster)
- ✓ 90%+ inbox placement (check Postmaster)
- ✓ Bounce rate below 3%
- ✓ Reply rate above 3%
- ✓ SPF, DKIM, DMARC all authenticated
- ✓ CNAME tracking domain configured
- ✓ Reply automation set up (if needed)
- ✓ Campaign copy reviewed for spam triggers
- ✓ List quality verified (no role accounts, no invalid emails)
Once all 10 items check out, you're ready to scale. This warmup protocol has never failed us across 200+ domains.