Metrics
What is Google Postmaster Tools (GPT)?
Google's free dashboard reporting how Gmail rates your domain's sending reputation and spam rate.
Google Postmaster Tools is a web dashboard that surfaces Gmail-side data about mail from your authenticated domain, including domain and IP reputation, user-reported spam rate, authentication pass rates, and delivery errors. Access requires verifying domain ownership with a DNS TXT record. Data only populates once the domain sends meaningful daily volume to Gmail.
Why it matters for cold email
Gmail is the dominant inbox for most B2B prospects, and GPT is the only direct window into how Gmail itself rates you, especially the user-reported spam rate Google wants kept under 0.3%. Cold senders rely on it to catch reputation decline and complaint spikes early, before they quietly tank inbox placement.
Related terms
Stop guessing at deliverability.
Scheduler Zero handles authentication, warmup, and sender reputation so your cold email lands in the inbox, not the spam folder.