Please add ebuild for mailpile ( https://www.mailpile.is/) Thanks in advance!
See also: https://github.com/pagekite/Mailpile
This makes it currently a huge mess: https://github.com/pagekite/Mailpile/issues/425
https://github.com/mrueg/mrueg-overlay/blob/master/mail-client/mailpile/mailpile-9999.ebuild