I saw this.  I am tempted to sign up.
Bitmessage is simply not email.  When you want to communicate you have to either introduce someone to bitmessage or find someone already using it.  Correct ?
THis is why I pushed for an email DAC so that DACs can interface with emails.  (Even if they can't be fully trusted..)  If not that type of DAC, I believe one could make a DAC similar to the project in the OP.  It would also step on keyhotee's toes.  I'm really not interested in another communication systemw until it has widespread adoption.  I don't see anything taking over email anytime soon... so other options all seem like a deadend to me.  If I had a circle of peers using some other technology, then sure.. but everyone uses email.