I'd love to hear more about the outgoing SMTP service for people network hopping - I'm not sure I completely understand it and my curiosity is just getting the best of me. :)
Our service, one of a few, offers SMTP Auth'd or just relying on MAIL FROM: envelope header for outgoing email, utilising TLS, especially useful when on free-wifi.
Set your SPF settings to allow our sending IP in order to improve one's SPAM score.
The TLS route means that if one is sending to a GMAIL account then it is the recipient who can break the chain of trust.
If you have an SMTP receiver you can send from an open wi-fi access point in Karachi and know that only in server was the plain text processed. I guess that's not saying much but you can easily set it up for yourself.
Hopefully I'm understanding this correctly: you're creating a service that lets you send emails securely using your hosted SMTP, from anywhere in the world?
Yes, that's the one. There are more than one available. I'm not going to spam the name of mine.
It's a service I wanted myself as an early adopter of handheld computers, outgoing SMTP is one of those things where the ISP does everything it can to make you use user@mobileisp.com and even when it is plain, remembering the settings if your phone gets wiped, is it mail.example.isp.com or smtp.example.isp.com. Hopefully it is a bit easier to remember the smtp service one uses.
Tell us more!