blog.backToBlog
Email Domain Warm-Up: The Step-by-Step Protocol
5 min blog.readSuffix Mar 2026
Skip warm-up and you'll land in spam. Follow this protocol to build sender reputation safely.
## The 4-Week Protocol Week 1: 5 emails/day to real contacts. Week 2: 15 emails/day. Mix real + warm leads. Week 3: 30 emails/day. Begin cold outreach. Week 4: 50 emails/day. Full cold mode. Never exceed 50 cold emails/day per domain. Set up your email infrastructure.