MrMime is a pure implementation of 7 standards about the email. You can see an example to extract an image from an multipart email:
You can see the abstract about this project for the ICFP.
You can see an example of MrMime to the test.ml file. It's a step-by-step program to extract an image from an email. You can execute this program with utop like:
$ utop test.ml > mrmime.gif
After a make install of this project.
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This work was funded in part by the EU FP7/2007-2013 User Centric Networking project, grant agreement no 611001.