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A comprehensive study of what might go wrong when trying to guarantee that data has been written to disk.
to correctness email fs os ... on 31 December 2015
DMARC.org - Domain-based Message Authentication, Reporting and Conformance
Using DNS records to specify how SPF and DKIM should be applied to your domain -- you can set up a magic record and people receiving email will send you reports, which is kind of neat. On the downside, this doesn't solve the killer problems with SPF/DKIM (breaking legitimate forwarding and mailing lists)...
MultiRBL.valli.org - Blacklist, Whitelist and FCrDNS check tool
Search a large collection of spam-filtering systems. Neat -- although it turned out that wasn't the problem I was trying to solve!
Are you looking for something ?
Lots of information on mail and DNS, among other things (written in a decent approximation of Dan Bernstein's forthright style). This is the site with the handy reference to different mbox formats.
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tasty by Adam Sampson.