Space CRM / Blog
Domain Warming Guide: Build Sender Reputation from Zero
A complete domain warming schedule — day-by-day send volumes, what to monitor, and when you are ready for full volume.
Why domain warming exists
A new domain has no sending history. Inbox providers use historical patterns to determine inbox vs spam placement. Sending thousands of emails from a new domain immediately triggers spam filters.
Warming builds reputation gradually by demonstrating consistent, low-complaint sending over 4-6 weeks.
The warming schedule
Week 1: 50/day. Week 2: 200/day. Week 3: 500/day. Week 4: 1,000/day. Week 5: 3,000/day. Week 6+: scale to target. Send only to your most engaged contacts during warming.
SpaceCRM's mailbox warmup automates this schedule by sending warmup emails between SpaceCRM accounts and automatically opening and replying to build engagement signals.
Metrics to monitor
Watch: inbox placement rate (target 95%+), spam folder rate (keep below 2%), open rate (above 20%), complaint rate (below 0.1%).
If spam placement exceeds 5%, pause immediately. Review authentication setup, list quality, and email content before resuming.
