If there is no way for a reader to know that the message you post is not your own work whatever the source, yes, that would be plagiarism.
Good message posting practice has always been to provide a link to anything you post that you did not write.
407,321,106,308: The TOTAL electronic shares of CMKX as of 03/04/2005. If the NSS of CMKX is not there, IT DOES NOT EXIST.