Mail is now operational on Debian however, elm will not be available. I can not get elm-2.5.8, the last official version, to compile. C syntactical requirements have just changed too much for even clang to properly grok the code anymore and that’s always been my go-to compiler for antique code.
If there are other applications you would like that are not there, please e-mail support@eskimo.com or generate a ticket requesting their installation.