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The name of the message tag. The message tag name has to meet the following criteria:
It can only contain ASCII letters (a–z, A–Z), numbers (0–9), underscores (_), or dashes (-).
It can contain no more than 256 characters.
The value of the message tag. The message tag value has to meet the following criteria:
It can only contain ASCII letters (a–z, A–Z), numbers (0–9), underscores (_), or dashes (-).
It can contain no more than 256 characters.
Contains the name and value of a tag that you apply to an email. You can use message tags when you publish email sending events.