Sender reputation (Google Postmaster)

Why this exists

Google Postmaster Tools shows how Gmail treats your mail: but it lives in a separate Google property most teams check inconsistently. SenderSignal pulls the same official Google data into the Sender Reputation tab on each domain so reputation sits next to blacklists and deliverability.

One-time setup

1. Open a monitored domain asset (root domain or subdomain that sends to Gmail).
2. Go to the Sender Reputation tab.
3. Follow the guided linking flow:
   • Confirm the domain in Google Postmaster Tools (DNS TXT verification)
   • Authorize SenderSignal to read Postmaster metrics for your workspace
4. After linking, SenderSignal syncs on a schedule (typically every few hours). Manual Refresh triggers an immediate sync.

Setup is per domain in Postmaster. Subdomains may inherit or require separate registration depending on how Google grouped them: the UI guides you through the correct domain string.

What you see (Sender Reputation tab)

Pick the mailbox provider at the top of the tab. Gmail & Google Workspace is live today; Microsoft Outlook & 365 and Yahoo & AOL Mail are listed as coming soon. For Gmail you see:

• Sender reputation score: a 0 to 100 score with a High / Medium / Low / Bad label, built from Google's deliverability verdict, the user-reported spam rate, delivery behaviour to Gmail and Gmail delivery errors, with a line for each factor explaining what it measured and what to do
• Gmail authentication: how mail to Gmail authenticated, from your DMARC aggregate reports
• User-reported spam rate, DMARC pass rate and DKIM pass rate: the latest day Google published, with its date. Some days Google sends a TLS message count of 0 together with 0% for SPF, DKIM and DMARC. Such a day is treated as missing data unless Google's sender checklist shows SPF, DKIM or DMARC alignment needing work, and always when Google also published a spam rate above 0 for it (Google measures spam only on DKIM-authenticated mail). On a missing day the DMARC and DKIM tiles show the latest day with real figures and its date, and the spam rate for that day is shown as Google sent it. A 0% on any other day is shown as 0%.

Google no longer publishes the daily domain and IP reputation categories through its API, so SenderSignal no longer shows them; the score above is the replacement.

Sender Analytics (Gmail dashboards)

The Sender Analytics button opens the Gmail dashboards with charts and tables over a selectable range (7 to 120 days):

• Compliance status (requirements met vs needs work)
• Spam (user-reported spam rate per day)
• Authentication pass rates (SPF, DKIM, DMARC over authenticated traffic). A day treated as missing data (see above) has no point on these charts, the line joins the days either side, and the Authentication table leaves that day out.
• Encryption (TLS inbound/outbound). Inbound TLS follows the same rule on a missing day.
• Delivery errors (rate per day and the reasons Google gives)

Linked vs not linked

• Not linked: domain not verified in Postmaster or not yet synced; tab shows setup instructions
• Syncing: background job fetching latest Google data (usually completes within a minute)
• Linked: charts populated; last sync time shown

Alerts

Configure Postmaster-based alerts under Alerts:

• Gmail deliverability verdict worsened or improved
• Compliance status change
• Spam rate crossing elevated thresholds

Plan requirement

Google Postmaster integration is included on plans that list Sender Reputation / Postmaster in your subscription. Without it, the tab shows upgrade guidance.

Deliverability checks → · Alert channels →