An SMTP send is fast and silent: your application hands the message off, the relay delivers it, and unless something goes wrong you never see what happened next. Mailpro changes that by collecting detailed statistics on every SMTP message — from the moment it leaves your application to the moment the recipient opens it — and presents them in a real-time dashboard.
What gets tracked, and how
Mailpro adds a unique tracking identifier to every SMTP message and uses three distinct techniques to capture events:
| Event | How it’s collected | Latency |
|---|---|---|
| Accepted by relay | Logged when SMTP DATA is acknowledged | Instant |
| Delivered to ISP | From the SMTP success code returned by the recipient’s mail server | < 1 minute |
| Bounce (hard/soft) | SMTP error code or DSN from recipient | 1–15 minutes |
| Opened | 1×1 transparent pixel loaded by the email client | Real-time |
| Clicked | Links rewritten through the Mailpro click tracker | Real-time |
| Spam complaint | Feedback Loop reports from ISPs | Hours to days |
| Unsubscribe | One-click List-Unsubscribe header (RFC 8058) | Real-time |
Where to read the statistics
Inside Mailpro open Reports → SMTP statistics. You see aggregate figures (delivered, opens, clicks, bounces, complaints) and a per-message log searchable by recipient, message ID, IP and date range.
Webhooks for real-time integration
If you want events pushed to your own system, enable webhooks under Account → Webhooks. Mailpro POSTs a JSON payload to your URL for each event:
{"messageId":"abc123","event":"delivered","timestamp":"2026-05-07T10:00:00Z","recipient":"[email protected]","smtpResponse":"250 OK"}
What about privacy?
Open tracking relies on a 1×1 pixel. Some clients (Apple Mail Privacy Protection, some corporate gateways) pre-fetch images, which can over-report opens. Click tracking is more reliable. Both can be disabled per message via the X-Mailpro-Tracking: false header for fully privacy-respectful transactional email.
Retention and export
SMTP message logs are kept for 90 days in the dashboard and can be exported to CSV at any time. For longer retention, store the webhook events in your own data warehouse.
See every SMTP message in real time
Mailpro’s SMTP statistics and message tracking show every step from accept to open. Read the full SMTP tracking FAQ.