Tags
Tags label your emails in Lettermint. Set Tags in Settings → Email to add them to all emails.
Write them as comma-separated name=value pairs:
environment=production, campaign=welcome- Names have 1 to 32 characters and values 1 to 64. Use only letters, digits,
_and-. - Each name can be used once. Names starting with
__lettermintare reserved. - An email can have up to 20 tags.
With the Pro edition, each site can add its own tags.