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 requestListMailboxes : string -> Vmail.listing
val requestNewMailbox : {domain : string, user : string,
passwd : string, mailbox : string} -> unit
val requestPasswdMailbox : {domain : string, user : string, passwd : string}
-> unit