This isn't directly spam-related but since some anti-spam schemes (e.g. Michael Kaplan's) generate DSNs and require the user (or his system) to act on them this may be of interest: I have recently begun to collect information about the generation and handling of DSN messages. More specifically, the points I am interested in are: * What format are DSN messages generated in? Do they conform to RFC 3464? Do they contain all relevant information? Is it presented in a human (user) readable manner? Do they contain the complete undelivered message or just part of it? * Are DSNs generated by other systems passed through faithfully, or are they in some way changed? * How is the DSN presented to the user? Does the user see all the information in the DSN? Does he get extra information? (for example, there may be explanations for the extended status codes)? Is the DSN linked to the bounced message? * How are unusual cases (e.g., multi-line SMTP responses or SMTP responses with very long lines or non-ASCII characters) handled? First, has anybody already done this? I can't believe I'm the first, but my googling skills don't seem adequate to find anything. Secondly, I'm asking for material: DSNs, screenshots, etc. Feel free to edit out sensitive information (email addresses, bodies of bounced mails, etc.) but if you do, please state clearly what you removed. The more information you can supply, the better. For now, I'll just collect everything I get on http://www.hjp.at/mail/dsn/. That should become a bit more structured as I get more material. I'll also set up some test addresses which reject mail with different messages. For now you can try <nosuchuser at hjp.at> and <cookie at hjp.at>. hp -- _ | Peter J. Holzer | Schlagfertigkeit ist das, was einem |_|_) | Sysadmin WSR | auf dem Nachhauseweg einfällt. | | | hjp at hjp.at | -- Lars 'Cebewee' Noschinski in dasr. __/ | http://www.hjp.at/ |
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