By Guido Schryen
This booklet examines anti-spam measures by way of their potentials, obstacles, benefits, and downsides. those elements verify to which quantity the measures can give a contribution to the aid of junk mail in the end. It examines legislative, organizational, behavioral, and technological anti-spam measures, together with an perception into their effectiveness. moreover, it provides the conceptual improvement and research of an infrastructural electronic mail framework, which good points this kind of complementary program, and considers deployment issues.
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Extra info for Anti-spam measures : analysis and design
In the case where a spammer pretends to send e-mails on behalf of a particular organization – joe jobs and phishing e-mails are examples of what is denoted as “identity theft” –, a loss of reputation may occur. e. those marketers that send e-mails only to recipients who have opted in, may lose their reputations if they are associated with spamming activities. The loss of reputation is diﬃcult to quantify. e. if the false-positive and/or false-negative rates are too high. On the other hand, ESPs can gain a good reputation by providing eﬀective anti-spam systems.
G. if an RCPT command appears without a previous MAIL command, the server must return a 503 “Bad sequence of commands” response. When the SMTP server accepts a message either for relaying or for ﬁnal delivery, it inserts a trace record (also referred to as a Received entry) at the top of the mail data. This trace record indicates the identity of the host that sent the message, the identity of the host that received the message, and the date and time the message was received. Relayed messages will have multiple time stamp lines.
Even if all these recommendations for traceability and accountability are followed, they do not eﬀectively address the speciﬁc scenario where spam is sent out from infected computers of innocent users. Then, the user’s computer would be identiﬁed as a spam source, leading to this particular computer being ﬁxed, but not to the real spammer being identiﬁed. In order to protect local users from receiving spam e-mails, MTAs should be able to refuse e-mails from a particular host or a group of hosts.