+ val requestListMailboxes : string -> Vmail.listing
+ val requestNewMailbox : {domain : string, user : string,
+ passwd : string, mailbox : string} -> unit
+ val requestPasswdMailbox : {domain : string, user : string, passwd : string}
+ -> unit
+ val requestRmMailbox : {domain : string, user : string} -> unit
+
+ val requestSaQuery : string -> unit
+ val requestSaSet : string * bool -> unit
+
+ val requestSmtpLog : string -> unit