The Add Header action adds a custom header to the received email. You typically use this action only in combination with another action. This action has the following options.
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Header name—The name of the header to add. It must be between 1 and 50 characters, inclusive, and consist of alphanumeric (a-z, A-Z, 0-9) characters and dashes only.
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Header value—The value of the header to add. It must be less than 2048 characters, and must not contain newline characters ("\r" or "\n").
