Tags can be attached to any taggable record, and help organize your workspace as well as trigger workflows as they emit webhooks. Tags are unique per workspace, and tags created in a workspace will not be created in other workspaces.

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Taggables

Taggables are the records that can be tagged. They are leads, campaigns, and sender emails. Any tag can be attached to any taggable.

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Default Tags

Every workspace will have the same following tags created by default. 
Interested
Meeting Booked
Google
Outlook
Zoho
Custom Mail Server
Proofpoint
Mimecast
Barracuda
Automated Reply
If you wish to create more tags automatically when a workspace is created, the creating template workspaces walktrough contains instructions on how to do so.