JangoMail is one of the first e-mail marketing companies to launch support for both DomainKeys and DomainKeys Identified Mail (DKIM). The official announcement and press release will be issued on Monday, but emails that you send with a @jangomail.com From Address are already being cryptographically signed with DomainKeys and DKIM!
This will help with deliverability to receivers that validate based on these technologies, like Yahoo! Mail and GMail.
For more information JangoMail's implementation of DomainKeys/DKIM and for instructions on how to set up your own From Address domain to take advantage of these technologies, see the document:
DomainKeys and DKIM in JangoMail