Cloud Server for Email
cloudserverforemail.com · infrastructure@cloudserverforemail.com · +372 602 3545
EU-Based Infrastructure
Operating Since 2015
Operating Since 2015
Google Postmaster Tools Guide
Setup, Metrics, and Daily Monitoring Workflow
Version 2026-04 · Cloud Server for Email
Setup: Verify Your Domain
- Go to postmaster.google.com — sign in with Google account
- Click "+ Add Domain" — enter your sending domain (e.g., mail.yourdomain.com)
- Choose verification method: TXT record or CNAME record
- Add verification TXT record to DNS at _postmaster-domain-verification.yourdomain.com
- Click "Verify" in Postmaster Tools — propagation takes 15 min – 4 hours
- Repeat for each sending domain/subdomain
Key Metrics Explained
| Metric | What It Measures | Target | Action Threshold |
|---|---|---|---|
| Domain Reputation | Google's assessment of your sending domain: Bad/Low/Medium/High | High | If Medium or lower, investigate |
| Spam Rate | % of your mail users mark as spam | <0.05% | 0.10% = action; 0.30% = blocking risk |
| IP Reputation | Per-IP reputation tier: Bad/Low/Medium/High | High for all IPs | Medium = reduce volume; Low = pause and remediate |
| Authentication | % of messages passing SPF, DKIM, DMARC | 100% | Any failure below 99% needs investigation |
| Delivery Errors | % of messages getting delivery errors | <1% | >5% = infrastructure or policy problem |
| User-Reported Spam | Complaints from Gmail users | 0 | Any sustained complaints = list quality issue |
Reputation Tiers: What They Mean
🟢 High Reputation
Most mail delivered to inbox. Maximum ISP connection limits available. This is the target state for all sending IPs and domains.
🟡 Medium Reputation
Some mail may go to spam. Google applies additional filtering. Investigate: recent complaint spike, engagement drop, or cold/reactivation campaign.
🔴 Low Reputation
Significant filtering expected. Reduce volume immediately, pause cold or reactivation campaigns, focus on highest engagement only.
⚫ Bad Reputation
Mail being blocked. Contact postmaster.google.com for review after resolving root cause. This state can take weeks to recover from.
Daily Monitoring Workflow (5 minutes)
- Log in to postmaster.google.com
- Check Domain Reputation: compare to yesterday (same/better = ✓; worse = investigate immediately)
- Check Spam Rate: must be below 0.10%; review 7-day trend
- Check IP Reputation: all sending IPs should show High
- Check Authentication: must be 100% (any failures = configuration change broke something)
- If any metric is worse than yesterday: check accounting log deferral rate, recent campaign spam rate, any list changes
Reading the Spam Rate Graph
The spam rate in Postmaster Tools uses a logarithmic scale. The threshold lines are at 0.10% (action level) and 0.30% (blocking risk level). The data shows a 7-day rolling average — a single campaign with high complaints will affect the 7-day average for a week.
Causes of rising spam rate: sending to inactive subscribers (180+ days since last engagement), list purchases, overly frequent sending, content triggering spam filters, unsubscribe mechanism not functioning.
Postmaster Tools data is updated daily at approximately 08:00 CET for the previous day. Data is only available if you sent at least 100 messages to Gmail on the measurement day.