How to upload an mbox file to an IMAP server

Since no-one has came up with an idea, I had to get deeper in LUA programming language.

The answer is here if later someone finds him/herself in a situation like this:

options.timeout = 120
options.subscribe = true

localhost = IMAP {
    server = 'ipaddress',
    username = 'username',
    password = 'password',
}

sms=localhost.CSR:select_all()
if (sms ~= nil)
then
   subjects=localhost.CSR:fetch_fields({ 'subject' }, sms)
    if (subjects ~= nil)
    then
        for messageid, subject in pairs(subjects) 
        do
            local success, csrnumber = regex_search('^Subject: \\[([0-9]+)\\] ', subject)
        if success 
            then 
                localhost:create_mailbox('CSR.'..csrnumber)
                localhost:subscribe_mailbox('CSR.'..csrnumber)
                local tmp = {}
                tmp[messageid]=true
                localhost.CSR:move_messages(localhost['CSR.'..csrnumber], tmp)
            end
        end
    end
end

check also imapsync, a great tool !!!