In the window that appears, confirm removal by clicking Yes, delete the tag.
Deleting a tag also deletes all aggregate stats collected for the tag. Deleting a tag cannot be undone. If new emails are sent with the same tag, that tag will be recreated—you'll need to ensure you've stopped sending with the tag before deleting.
Use the Tags calls to manage tags via the Mandrill API.
Add tags in your API request
Mandrill creates tags for you automatically when you've included them in your sending API call. In this example, Mandrill will add "order-confirmation" and "order-shipped" to your list of tags if they don't exist already:
We'll create tags for you automatically when you include them in your email using the custom SMTP header, X-MC-Tags.
We'll also tag emails for you based on sender, template used (if any), and API key. Filter your Outbound Activity by these system tags using the Tagged drop-down menu.
Search activity by tags
Use the search query, tags:tagname, to filter activity based on tags included for your emails, or select a single tag using the Tagged drop-down menu on the Outbound Activity page.
When to use tags or custom message metadata
Tags are great for broad categories of messages like welcome or forgot-password emails. The content for these emails may vary, but the tag can help track data like opens and clicks for that type of email over time.
Metadata is generally better for managing more user-specific information like a 'user id' from your system, for example. Metadata information is returned in webhooks and searchable in Outbound Activity for your Mandrill account, so you can tie certain information back to data in your own system.
Tag-based stats are kept indefinitely, while metadata stats are not. Use the View Stats By drop-down menu to filter overall stats on the Dashboard in your Mandrill account, or by using the tags API calls.
Stats are accumulated using tags, but Mandrill stores only 100 tags per account (not including system-generated tags), so this should not be unique for every message or change frequently.
Tags should be 50 characters or less. Any tags starting with an underscore are reserved for internal use and cannot be used.