How does SenderSignal detect blacklist listings?

Checks run immediately when you add an asset, on your plan schedule, and whenever you rescan. When a listing is newly detected, alerts can reach your team through the channels you configure.

Which blacklists does SenderSignal monitor?

SenderSignal monitors 44 or more blacklist vendors, including major DNSBL and URIBL feeds. The vendors available to you depend on your subscription plan.

Where do alerts get delivered?

Email, Slack, and HTTPS webhooks. Webhooks work well for PagerDuty, Microsoft Teams adapters, and custom automation. You can subscribe each channel to the event types that matter to your team.

Reputation Shield

Sender reputation (Google Postmaster)

Gmail and Google Workspace sender metrics (domain reputation, spam rate, authentication, and compliance) synced into SenderSignal.

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

Open a monitored domain asset (root domain or subdomain that sends to Gmail).
Go to the Sender Reputation tab.
Follow the guided linking flow:
- Confirm the domain in Google Postmaster Tools (DNS TXT verification)
- Authorize SenderSignal to read Postmaster metrics for your workspace
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)

Domain reputation: High / Medium / Low / Bad daily category from Google
IP reputation: when Google publishes IP-level categories for your traffic
User-reported spam rate: percentage of users who marked mail as spam
Charts and tables with selectable date ranges (7–120 days)

Google Postmaster Tools (compliance dashboard)

A secondary view covers Gmail sender compliance requirements:

Compliance status (requirements met vs needs work)
Authentication pass rates (SPF, DKIM, DMARC over authenticated traffic)
Encryption (TLS inbound/outbound)
Delivery errors
Feedback Loop spam rates

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:

Domain or IP reputation change (e.g. High → Medium)
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 →