> ## Documentation Index > Fetch the complete documentation index at: https://sailia-mintlify-5b02008a.mintlify.site/llms.txt > Use this file to discover all available pages before exploring further. # Campaign results > Understand the metrics Sailia records after a campaign has been sent. After a [campaign](/customers/campaigns) is sent, Sailia records results that show what happened — how many emails reached inboxes, who engaged, and what bookings came back as a result. Use these to judge whether the message landed and to improve the next send. ## Metrics Sailia records | Metric | What it measures | | --------------------------- | -------------------------------------------------------- | | **Sent** | Total recipients the email was delivered to | | **Opened** | Recipients who opened the email | | **Clicks** | Total clicks on links inside the email | | **Failed** | Sends that could not be queued for delivery | | **Bounced** | Emails rejected by the recipient's mail server | | **Spam complaints** | Recipients who marked the email as spam | | **Unsubscribed** | Recipients who opted out via this campaign | | **Conversions and revenue** | Bookings and revenue attributed to clicks from the email | ## Reading the numbers | Pattern | Likely cause | | ------------------------------ | ------------------------------------------------------------------------------ | | **High open rate, low clicks** | Subject line worked, but the body or call-to-action needs improvement | | **Low open rate** | Subject line, sender name, or send time isn't resonating | | **High bounce rate** | Contact list quality issue — old or invalid addresses | | **High unsubscribe rate** | Audience was too broad, or the content didn't match what they expected | | **High spam complaints** | Subject feels misleading, send is too frequent, or unsubscribe is hard to find | ## How to use the results * Compare the audience size and conversions side by side. A small, well-targeted audience often beats a large, vague one. * If a metric looks unusual, check the audience filters first — most issues trace back to who received the email. * Treat each send as an experiment. Change one variable (subject, audience, time) at a time so you can tell what made the difference. ## Monitoring campaign volume Sailia records every campaign send against the `campaign-email-sent` [built-in meter](/api-reference/meter-tracking#built-in-meters), with the campaign's ID, UUID, and internal name attached to each entry. You can review volume in two places: * **Settings dashboard** — a **Campaign Emails Sent** card shows the running total for the current month. * **Meter usage API** — query `campaign-email-sent` for any date range to break sends down by campaign using the `ExtraInfo` payload. This helps you stay within plan limits, reconcile marketing volume against billing, and spot unusually large sends before they go out. ## Sent campaigns are read-only Once sent, a campaign can't be edited. Clone it from the campaigns list if you want to reuse the content for a future send. ## Related guides Create and send a campaign end to end. Build the recipient list that drives your results. Practical campaigns paired with filters and outcomes. Query campaign volume through the API.