What’s “warming back up” after a reputation crash?
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Your open rates tanked, your emails started landing in spam, and inbox providers are clearly not fans of you right now. You've fixed the root cause (hopefully), and now you want to start sending again. That process is called warming back up, and it's not the same as a standard warmup from scratch.
When you warm up a brand-new domain or IP, you're starting from neutral. Providers don't know you yet. When you're warming back up after a reputation crash, you're starting from negative. That's a harder place to climb from, and providers are watching you more closely.
Start much smaller than you think
Cut your sending volume by 80 to 90 percent from your pre-crash levels. Not 50 percent. Not 70 percent. This is not the time to be optimistic. You want to send a small number of emails that perform extremely well, not a large number that perform adequately.
Who counts as "extremely well"? People who opened your emails in the last 30 to 60 days. That's it. Everyone else waits. Your most engaged subscribers are the ones who will open, click, and signal to Gmail and Outlook that you're worth trusting again.
Increase slower than you did the first time
A fresh warmup might grow volume by 20 to 30 percent every few days if things are going well. A recovery warmup should grow slower. Think 10 to 15 percent increases, with longer pauses between steps to observe what's happening. Any spike in spam placement or complaints means you pause and hold, not push through.
The full recovery window is typically 4 to 8 weeks, and sometimes longer depending on how bad the damage was. (Some senders never fully recover to their previous volume safely, and that's worth accepting rather than forcing.)
Monitor obsessively during this period
Check your deliverability signals at every step. Inbox placement rate, complaint rate, and bounce rate are your three main gauges. If your inbox placement drops below 85 percent or your complaint rate climbs above 0.1 percent, pull back. Don't rationalize a bad signal away.
It's also worth checking whether your domain landed on any blocklists during the crash. You can run a free check with our blocklist checker to see if you're flagged anywhere that needs a manual delisting request.
The mindset shift that matters most
Now a standard warmup is about building trust. A recovery warmup is about proving you've changed. Providers have data on your past behavior. You're asking them to update that data, which takes time and consistent positive signals. Rushing it is the most common way to turn a 6-week recovery into a 6-month one.
If you're deep in a reputation crisis right now and need help thinking through the recovery plan, our SOS hotline is free. Reach out here and we'll walk through it with you.
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