SendLit DocsSender reputation
See how Gmail and Outlook rate your mail with Google Postmaster Tools and Microsoft SNDS.
Your email provider reports mail as "delivered" once Gmail or Outlook accepts it, even if it then lands in spam. Gmail and Outlook publish what they think of your mail through free tools, and SendLit shows that data on the Sender reputation card of the dashboard, with a 30-day trend.
What you see
Gmail (Google Postmaster Tools), per sending domain:
- Spam rate: the share of mail Gmail users marked as spam. Keep it below 0.1%; Google may reject or junk mail from senders above 0.3%.
- SPF, DKIM and DMARC pass rates: should be close to 100%; see Domain authentication.
- Delivery error rate: mail Gmail rejected or deferred.
- Meets Google's requirements: Google's verdict on its bulk-sender rules (authentication, one-click unsubscribe, spam rate, ...).
Google retired its "domain reputation" and "IP reputation" grades in Postmaster Tools v2, so SendLit shows the numbers above instead.
Outlook (Microsoft SNDS), per IP address you send from:
- Filter result for each day: green (under 10% of mail filtered as spam), yellow (10% to 90%) or red (over 90%);
- complaint rate and spam trap hits.
SNDS covers IP addresses, so it's useful only if your email provider gives you a dedicated IP. On shared IPs, rely on Postmaster Tools.
Alerts
SendLit checks the data every day and shows alerts on the card. It also emails your organization's owners when one starts or gets worse:
| Signal | Warning | Critical |
|---|---|---|
| Gmail spam rate | 0.1% or more | 0.3% or more |
| Google sender requirements | Not met | |
| SNDS filter result | Yellow | Red |
When an alert appears, stop sending to contacts who haven't opened in months, check your authentication, and slow down with a daily send limit. Broadcasts and sequences also pause on their own when their own bounce or complaint rates get too high.
Connect Google Postmaster Tools
- Open Google Postmaster Tools, add your
sending domain (the part after
@in your From address) and verify it with the DNS record Google shows. - In SendLit, choose Connect Google Postmaster Tools on the dashboard and sign in with the same Google account. SendLit asks only for read access to Postmaster Tools traffic data.
- Data appears within a few minutes and refreshes daily. Google shows numbers only for days on which a domain sent enough mail to Gmail users, so a small list may show no data.
SendLit checks every domain your email providers send from. A domain marked Not in Postmaster Tools isn't verified with the connected Google account. To stop, choose Disconnect; SendLit deletes the stored access and data. You can also remove SendLit's access in your Google account's security settings.
On a self-hosted SendLit, an administrator first creates a Google OAuth client
and sets GOOGLE_POSTMASTER_CLIENT_ID and GOOGLE_POSTMASTER_CLIENT_SECRET;
see .env.example.
Connect Microsoft SNDS
- Sign in to SNDS and request access to your sending IPs (Request Access). Microsoft emails the address responsible for each IP to confirm.
- Open Automated Data Access, enable it and copy the data link.
- Paste the link under Outlook · Microsoft SNDS on the dashboard and choose Connect. SendLit downloads the data once to check the link.
SNDS links expire after 30 days. When yours does, the card says so; paste the new link from the same page.
API and MCP
GET /reputation returns the same data and alerts, and POST /reputation/sync
refreshes it. Connecting Google returns a sign-in URL from
POST /reputation/google/connect that a person opens in a browser. SNDS is
connected with PUT /reputation/snds. See the API reference
and the *_reputation MCP tools.