+ | MsgRmuser of string
+ (* Remove all ACL entries for a user, and remove all domains to which
+ * that user and no one else has rights. *)
+ | MsgCreateDbUser of {dbtype : string, passwd : string option}
+ (* Request creation of a user for the named DBMS type *)
+ | MsgCreateDbTable of {dbtype : string, dbname : string}
+ (* Request creation of a DBMS table *)
+ | MsgNewMailbox of {domain : string, user : string,
+ passwd : string, mailbox : string}
+ (* Request creation of a new vmail mapping *)
+ | MsgPasswdMailbox of {domain : string, user : string, passwd : string}
+ (* Change a vmail account's password *)
+ | MsgRmMailbox of {domain : string, user : string}
+ (* Remove a vmail mapping *)
+ | MsgListMailboxes of string
+ (* List all mailboxes for a domain *)
+ | MsgMailboxes of {user : string, mailbox : string} list
+ (* Reply to MsgListMailboxes *)
+ | MsgSaQuery of string
+ (* Check on the SpamAsssassin filtering status of a user or e-mail address *)
+ | MsgSaStatus of bool
+ (* Response to MsgSaQuery *)
+ | MsgSaSet of string * bool
+ (* Set the filtering status of a user or e-mail address *)
+ | MsgSmtpLogReq of string
+ (* Request all current SMTP log lines about a domain *)
+ | MsgSmtpLogRes of string
+ (* One line of a response to MsgSmtpLogReq *)
+ | MsgDbPasswd of {dbtype : string, passwd : string}
+ (* Change a DBMS user's password *)
+ | MsgShutdown
+ (* Halt the server *)
+ | MsgYes
+ | MsgNo
+ (* Answers to boolean queries *)
+ | MsgQuery of query
+ (* Ask for host-specific information *)