secondary-domains

Cold email deliverability and warm-up

Why Never Send Cold Email from Your Primary Domain

Protect your main domain’s reputation. Learn how sending cold emails from your primary domain risks inbox placement and delivery.

Email blocklists: monitoring, causes and delisting

Secondary Domain Blacklisted? What to Do in 2026

A secondary domain blacklisted? Learn how to diagnose and resolve it with real-time email verification, inbox placement tests, and list hygiene tools.