By Guido Schryen

ISBN-10: 354071748X

ISBN-13: 9783540717485

ISBN-10: 3540717501

ISBN-13: 9783540717508

This booklet examines anti-spam measures by way of their potentials, barriers, merits, and downsides. those components make certain to which quantity the measures can give a contribution to the aid of unsolicited mail ultimately. It examines legislative, organizational, behavioral, and technological anti-spam measures, together with an perception into their effectiveness. additionally, it offers the conceptual improvement and research of an infrastructural email framework, which beneficial properties this kind of complementary software, and considers deployment issues.

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Etc. etc. C: . com Service closing transmission channel Fig. 3: A typical SMTP transaction scenario [93] Regarding the SMTP delivery process some further issues are mentioned here which are either not modeled in detail or not at all in Fig. 2 in order to keep the model clear: There are circumstances in which the acceptability of the reverse-path (in MAIL FROM command) may not be determined until one or more forward-path (in RCPT TO commands) can be examined. In those cases, the server may reasonably accept the reverse-path (with a 250 reply) and then report problems after the forward-paths have been received and examined.

Double opt-in”, which is sometimes also referred to as “verified opt-in” or “closed loop opt-in”, requires that a subscriber takes two actions to get onto a list. The first action requests the addition of an e-mail address to a list, and the adding-on can be done, for example, via a web form or an e-mail. The owner of the list then sends a confirmation (challenge) message, which must be answered by the recipient. Only when this reply 46 4 Anti-spam measures is received is the address added to the list.

An MTA relay is usually the target of a DNS MX record that designates it, rather than designating the final delivery system. The relay server may accept or reject the task of relaying the mail in the same way it accepts or rejects mail for a local user. If it accepts the task, it then becomes an SMTP client, establishes a transmission channel to the next SMTP server specified in the DNS, and sends it the mail. If it declines to relay e-mail to a particular address for policy reasons, a 550 response should be returned.

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Anti-spam measures : analysis and design by Guido Schryen

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