From my understanding, sending an e-mail from Ziplip without a password is the same as sending it from a general account. ( Say AOL )
And if you send it with a password, thus encrypting it, the person you are sending it to would need the password to access the message. Now, in order for the recipient to know the password, you would have to send it by standard mail. Correct? Doesn't that put that password out there in the open for anyone trying to read your e-mail? As such, can't they use the password to access any mail you send with that password?