Case Study: Successful Email Warm-up Campaigns and Their Results
See real-world examples of email warm-up done right. Learn how businesses used warm-up strategies to improve inbox placement in 2025.
Last updated
See real-world examples of email warm-up done right. Learn how businesses used warm-up strategies to improve inbox placement in 2025.
Last updated
Email warm-up isn’t just a best practice — it’s a game-changer when done correctly. Still on the fence about its impact?
This compilation highlights real companies that used strategic warm-up methods to improve , increase , and boost campaign performance — all without burning their domains or reputations.
Let’s break down how they did it and what you can take away to apply in your own campaigns.
Challenge: A B2B SaaS company was launching a new campaign using a brand-new domain.
Approach:
Used a subdomain (outreach.brand.com)
Warmed up for 21 days using SenderWiz
Configured , rDNS
Gradually increased sends from 10 → 100/day
Sent warm-up emails to high-engagement inboxes with
Results After Warm-up:
Inbox rate: 94%
Open rate on first cold campaign: 37%
Reply rate: 8.2%
Zero spam complaints
Domain maintained excellent sender score
Approach:
Configured rotating IPs and sending identities
Distributed sending volume based on domain age
Ran warm-up for 3–4 weeks per inbox
Results After Warm-up:
Scaled to 1,500 emails/day with 10 inboxes
92–96% inbox placement
0.03% bounce rate across all campaigns
Approach:
Paused all live campaigns
Initiated manual + automated warm-up over 14 days
Rebuilt sending reputation using known buyers and engaged contacts
Reintroduced promotional campaigns only after inbox placement stabilized
Results After Warm-up:
Open rate recovery from 6% → 29%
Bounce rate dropped to 1.1%
Customer support tickets (re: missing emails) dropped 80%
Revenue from email channel increased 2.6x within 30 days
Approach:
Sent 10–15 emails/day for first 10 days
Used personalized messages and asked for replies
Transitioned to automated sending on day 15
Results After Warm-up:
100% inbox placement in test accounts
First cold campaign: 33% open rate, 6% reply rate
Landed two high-ticket consulting clients within 2 weeks
✅ Lesson: Even solo senders can win big with a simple, disciplined warm-up strategy.
Across all case studies, the winning strategies included:
✔️ Domain + IP authentication (SPF, DKIM, DMARC) ✔️ Gradual sending ramp-up ✔️ Warm-up using real or simulated engagement ✔️ AI or manual content rotation ✔️ Monitoring spam complaints, bounce rates, and open trends ✔️ Using smart platforms like SenderWiz to streamline warm-up
Email warm-up isn’t just technical — it’s tactical. The businesses above didn’t guess. They followed a process, used the right tools, and built a foundation that delivered real, measurable results.
Whether you’re launching a new domain, scaling cold outreach, or recovering from deliverability issues, a strategic warm-up is your fastest route to inbox success.
✅ Lesson: Slow, authenticated, and consistent pays off — even for new domains.
Challenge: An agency wanted to scale campaigns using multiple inboxes across different clients and domains.
Created and warmed 10 inboxes using by SenderWiz
Enabled
Improved through smarter segmentation
✅ Lesson: and rotation allow agencies to scale safely without hurting deliverability.
Challenge: A mid-size brand faced high bounce rates and poor engagement after switching ESPs.
Used to monitor engagement
✅ Lesson: Sometimes stepping back and is the fastest way forward.
Challenge: An independent consultant launching a personal cold email outreach campaign on a new domain.
Started with
Monitored using test addresses
Want to see similar results with your campaigns? helps you automate and optimize your entire warm-up journey — from to and — so you don’t just send more emails… you land more results.