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Unsubscribe reason states "Reply Mail Management" when it isn't enabled for an account in Marketing Cloud Email

Knowledge Article Number 000213479
An Unsubscribe Reason can show up as "Reply Mail Management" (RMM) due to a response provided by certain email clients even when that feature isn't enabled in your Account.
These email clients are typically on a Unix based system. They can generate a response that uses the LEAVE option. When the recipient uses this option, it causes the RMM process to pick up those replies and process the LIST_UNSUBSCRIBE header, which stores the LEAVE reply. This type of reply uses the same process that the RMM process uses so it's recorded as such by the system. It isn't possible to differentiate between a client responding with the LEAVE command versus a standard RMM response. 

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