Gets the tag.
The tag of the response; or "*" if the response is untagged.
IMAP4 uses tagged commands and responses. Each command contains a tag, which is typically a string that contains just digits or letters. When the server finishes executing a command, it sends back a status response, such as an OK response, which contains a tag that matches the tag sent in the command.
The Tag property value contains the tag from the
status response. If the response is not a tagged response, the
property value is "*".
BaseStatusResponse Class | Hunny.Mail Namespace | Status responses section in the IMAP4 specification