Try converting the list to bytes array with something similar to this, using byteconverter:
data = bc.IntsToBytes(Array As Int(list.Size))
(depends on the type of values)
Then use job.postbytes
This is ok if you know the size of each item in the receiving side, to reconstruct the data.
alternatively you can add all the list to one string (like comma separated) and send it by poststring.