A system for processing an e-mail is disclosed. The system includes: a host, for issuing a first request to get a mail subject of the e-mail; a first server, for sending a first information associated with the e-mail, wherein the first information includes at least the mail subject and does not include all mail contents of the requested e-mail; a second server, for analyzing a second information to determine whether or not the mail subject is delivered to the host and then outputting an analysis result; and a parser, for receiving the information, outputting the second information to the second server, and directing the mail subject to the host if the analysis result indicates the parser should deliver the mail subject to the host.