Domain delivery statistics (bounces, complaints, sends)

Smailor tracks per domain and per day how many messages were sent, how many bounced, and how many spam complaints (e.g. “report spam”) were received. This data helps you see whether a domain is healthy for outbound mail.

Where to see the numbers

Settings → API — summary for the last 30 days, by domain, plus recent events. Optimized for people using the REST API and custom domains.
Settings → Monitoring — full daily breakdown, full event list, and background automation history (account owners).

Statistics only include domains that appear on your active addresses (verified custom domains tied to your account).

How data is collected

Sends increase when outbound mail for that domain is accepted into the pipeline for billing and reputation tracking.
Bounces and complaints come from feedback sent back by mail providers and our delivery stack; each event updates the daily rollups you see for that domain and calendar day.

If you see no bounces yet, it may simply mean none were reported in the window, or signals have not reached us yet after DNS or list changes.

Understanding rates

For a given day and domain, the app may show:

Bounce rate ≈ bounces / mails_sent (if there were sends that day)
Complaint rate ≈ complaints / mails_sent

In the app, the same definitions are used for the 30-day summary on the API page and the day-by-day table under Monitoring.

Guidelines used internally for alerts (illustrative; thresholds may change):

Complaint rate above about 0.3% is a serious deliverability risk.
Bounce rate above about 5% warrants list hygiene, validation, and domain/DNS review.

Use these as signals, not legal guarantees. Mailbox providers and filters change over time.

Improving bad stats

Remove invalid or old addresses; use double opt-in where appropriate.
Keep SPF, DKIM, and DMARC correct for the domain; see the email setup guide.

API surface

The public REST API is for sending email; it does not expose a separate JSON “stats API” in the first version. Delivery metrics are available in the dashboard as described above.

REST API — POST /api/v1/send
BIMI setup — logo in the inbox (optional branding)