My CSA implementation seems to work OK now (according to my tests). Any
more testing, code review, suggestions, bug reports etc. welcome. The
following patch is against the code from CVS, but it applies to 4.50 OK.
http://www.cus.cam.ac.uk/~fanf2/hermes/doc/antiforgery/exim-csa.patch
http://www.cus.cam.ac.uk/~fanf2/hermes/doc/antiforgery/exim-csa.docs
For those who don't know what CSA is, I've written a quick introduction:
http://www.cus.cam.ac.uk/~fanf2/hermes/doc/antiforgery/csa.txt
Tony.
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