Mailing List
Haraka has an active Mailing List which you can join by sending a mail to haraka-sub@harakamail.com. We are working on providing list archives.
Github
For everything else, we use Github. Post bug reports there on the issue tracker and feel free to browse the code and try and learn the structure of the project.
Haraka can be found at haraka/Haraka on Github.
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