Glossary
A Message-ID is a unique identifier automatically added to every email by the sending server. It’s formatted like an email address and looks something like this:
<KIYjfnefhuw6ehtwj4nfj+reuihun00Khis-HIAhdHFBb714@mail.emailclient>
This ID is used to:
Each recipient gets a message with the same Message-ID if it’s a broadcast-style send, but systems may add unique IDs per recipient if needed for tracking.
With Mailgun, the Message-ID lets you trace all events related to a message – like delivery status, opens, bounces, and clicks – across your email infrastructure.
Note: When sending an email with contacts in CC and BCC, mail recipient email and CC/BCC emails will share the same Message-ID. When sending a mass email, it is important that each recipient has its own Message-ID. If one API call contains multiple recipients, we’d recommend that you use recipient variables – that way you’ll have a unique Message-ID for each recipient.
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