See all 7 articles below:

• ○ Can Mailgun track what happens to my emails?
• ○ Webhooks
• ○ HTTPS Tracking & Links
• ○ Unsubscribe Handling & Links
• ○ How can I perform A/B testing on my emails?
• ○ How can I verify whether an HTTP POST is from Mailgun or forged?
• ○ How can I determine whether a recipient has replied to an email?