Open a sent campaign → tab Statistics. You see:
- Sent — how many mails went out
- Delivered — how many actually arrived (sent minus bounces)
- Opened — open rate (% and absolute count)
- Clicked — click rate (which link got the most clicks)
- Unsubscribed — how many unsubscribes
- Bounces — hard and soft broken out
Good B2B benchmarks: 25-35% open rate, 3-5% click rate. Below those numbers: check your subject line, recipient-list quality, and domain reputation.