Enum MailFailureReason
Why a mail send or attachment claim was refused.
public enum MailFailureReason : byteFields
The named inventory slot was empty or locked.
The subject or body was empty, too long, or otherwise rejected.
The claimer's inventory had no room for the attachment.
The player is not near a mailbox, or it no longer exists.
The named recipient does not exist.
The request succeeded; no failure.
The sender does not hold enough currency to attach that much.
The mail had nothing attached, or it was already claimed.
The server could not process the request.