How does it work with network security, do you need to have a SMTP port open to the net?

Good point, I assumed email was asynchronous on the client side but needed to be online on the server side. If it is robust to server down time that makes it easier

Is exchange like a microsoft system?

I meant IMAP really, just got the terms mixed up, thanks

Thanks, that sounds useful.

Do you know of a self hosted webmail interface that has good features? So I guess that would run on the self hosted mail archive after imapsync.

Using it in tethering mode over a USB cable might be a better option, I use it all the time instead of a wifi hotspot