No, e-mail was not originally designed for you to host it yourself. E-mail was designed for a system operator to maintain a server for many other users.

Aside from the many maintenance problems of hosting e-mail yourself, the biggest problem here is the distance: Iceland is far away from the user in the USA. Latency doesn't matter so much for e-mail, but connectivity does, and if there's a problem with a transatlantic link (which does happen on occasion) there goes your most important communications medium.

Finally, the biggest fallacy with e-mail is that it is ever secure. It's never secure. The mail on your client devices is unencrypted, and if you ever reply, forward, or send an e-mail to anyone it's very likely for the whole thread go over an unencrypted relay and be stored temporarily, not to mention the logs, and the unencrypted storage on the destination, etc.

Your physical mail isn't secure in the postal service, and neither is your virtual mail in the e-mail service.