Monitoring Transactional Delivery
This guide explains how to track delivery performance, review individual email events, and diagnose issues for your transactional emails in Sender.
Where to Find This Feature
In the Sender dashboard, go to: Transactional emails → Metrics.
This opens the Transactional overview page. At the top, you will see summary cards for Total emails sent, Total delivered, Total opens, Total clicks, Unsubscribes, Hard bounces, Soft bounces, and Spam reports. Below the summary cards is a time-series chart that visualizes sending activity over your selected date range.
Three filter dropdowns — Event type, Domain, and Campaign — sit above the chart, along with a date range picker and frequency toggles for Hourly, Daily, Weekly, and Monthly views.
To view individual email events, click Logs in the left sidebar. This opens the Latest events log page, which displays a searchable, filterable table with columns for Event, Recipient, Subject, Template, and Date / time.
Steps to Monitor Transactional Delivery
Step 1 — Review Delivery Metrics on the Overview Page
Go to Transactional emails → Metrics. The summary cards at the top show aggregate counts for the selected period. Check Total emails sent against Total delivered to confirm emails are reaching recipients. Review Hard bounces, Soft bounces, and Spam reports for signs of delivery problems.
Use the date range picker in the upper-right corner to adjust the reporting period. Choose a preset such as Last 7 days or Last 30 days, or enter a Custom range and click Apply. Switch between Hourly, Daily, Weekly, or Monthly to change the chart granularity.
Step 2 — Filter Metrics by Event Type, Domain, or Campaign
Click the Event type dropdown to select or deselect specific events: Emails sent, Opens, Clicks, Bounces, Unsubscribes, or Spam reports. The chart and summary cards update to reflect your selection.
Click the Domain dropdown and use the Find by domain search field to isolate metrics for a specific recipient domain. Click the Campaign dropdown and use Find by campaign to narrow results to a particular transactional email template.
Combining these filters helps you pinpoint delivery patterns for specific audiences or message types.
Step 3 — Investigate Individual Events in the Logs
Go to Transactional emails → Logs to open the Latest events log. Each row shows the Event type, the Recipient email address, the Subject line, the Template used, and the Date / time the event occurred.
Use the Search bar to find a specific recipient or subject. Use the Event type, Domain, and Campaign dropdowns to narrow results. To reset all active filters, click Clear filters. Adjust the date range picker to expand or limit the time window. Use the View dropdown at the bottom to change how many rows display per page.
You can also jump directly from the Metrics page to a filtered log view by clicking the arrow (→) next to any metric card such as Total opens → or Hard bounces →.
Step 4 — Set Up Webhooks for Real-Time Delivery Notifications
Go to Account settings → Webhooks and click Add your first webhook (or Add webhook if you already have existing webhooks).
In the Add webhook dialog, enter your endpoint in the URL field and select a Topic from the dropdown. The bounces/new topic sends a notification to your endpoint whenever a bounce event occurs, allowing your system to react to delivery failures in real time.
Each webhook is secured with a Signing secret displayed at the bottom of the Webhooks page. Use this secret to verify that incoming webhook payloads originate from Sender.
Understanding the Data
Total emails sent — The total number of transactional emails dispatched from your account during the selected period. This count includes all send attempts regardless of outcome.
Total delivered — The number of emails accepted by the recipient’s mail server. A gap between sent and delivered counts indicates bounces or rejections.
Total opens — The number of times recipients opened your transactional emails. This is tracked via a pixel embedded in the email and may not capture every open (for example, if images are blocked).
Total clicks — The number of times recipients clicked a tracked link within your transactional emails.
Hard bounces — Permanent delivery failures, typically caused by an invalid or non-existent email address. Hard-bounced addresses should be removed from future sends.
Soft bounces — Temporary delivery failures caused by conditions such as a full inbox, a temporarily unavailable server, or message size limits. Sender will typically retry soft-bounced emails.
Unsubscribes — The number of recipients who opted out of receiving emails via the unsubscribe mechanism included in your messages.
Spam reports — The number of recipients who marked your email as spam. A rising count here can damage your sender reputation and affect deliverability to other recipients on the same domain.
Common Issues
Sent count is higher than delivered count → Some emails bounced or were rejected by the recipient’s server. Go to Logs, filter by Event type → Bounces, and review the affected recipients and domains. Check whether the addresses are valid and whether a specific domain is rejecting your messages.
Open rate appears unusually low → Many email clients block tracking pixels by default, which prevents opens from being recorded. This does not necessarily mean recipients are not reading your emails. Focus on Total clicks as a more reliable engagement signal.
High number of spam reports → Recipients are marking your transactional emails as spam. Verify that you are only sending expected, transaction-triggered messages to the correct recipients. Review your email content and sending frequency. A high spam rate can harm your domain reputation.
Bounces concentrated on a single domain → Use the Domain filter on the Metrics or Logs page to isolate the affected domain. Persistent bounces from one provider may indicate a block or configuration issue. Check your sending domain authentication (SPF, DKIM, DMARC) and consider contacting the recipient mail provider if the issue persists.
Logs show no data for the selected period → Verify that your date range includes the time frame when emails were sent. Click the date range picker and expand the range, or select Last 30 days. If the log is still empty, confirm that your API or SMTP integration is actively sending emails.
FAQs
How often are metrics updated on the overview page? Metrics update in near real-time. Refresh the page to see the latest delivery stats. You can switch between Hourly, Daily, Weekly, and Monthly views to change the level of detail shown in the chart.
Can I view logs for a specific transactional template? Yes. On the Logs page, click the Campaign dropdown and select the template you want to inspect. The table will filter to show only events associated with that template.
What is the difference between hard bounces and soft bounces? A hard bounce is a permanent failure — the email address does not exist or the domain is invalid. A soft bounce is a temporary failure — the mailbox may be full, or the server is temporarily unavailable. Sender retries soft bounces automatically.
Can I get notified about delivery events outside the dashboard? Yes. Go to Account settings → Webhooks and add a webhook with the bounces/new topic to receive real-time bounce notifications at your own endpoint. This lets your system respond to delivery failures programmatically.
How do I jump from a metric to its related log entries? On the Metrics page, click the arrow (→) next to any metric card such as Total opens → or Hard bounces →. This takes you directly to the Logs page pre-filtered to that event type and date range.