Theworld.com does not require you to download anything on my mac and all my friend has to do is do "ssh -something
username@theworld.com" and then it will ask for your password. The only problem with the world is, it costs money.
And that is exactly why you get that flexibility with them. Theworld.com offers
internet access and UNIX/linux shell accounts, in addition to just e-mail.
GMail on the other hand, doesn't offer this. They're an ad-supported "free" service, and you get what you pay for in that case.
For what it's worth: If you really know what you're doing, you could set up your own linux cloud server, register your own domain, set up e-mail services on it, and get e-mail through the ssh text interface for quite a bit cheaper than the $19.89 a month that theworld.com is charging, if your e-mail needs aren't particularly high-traffic. Of course, you wouldn't get their
dialup internet access though, should that still be of actual value to you.
Some domain names can be had for as low as $5.99 a year. And the place I use for cloud servers has their lowest virtual server tier at $10 a month. Others go as low as $5, but resources (RAM, disk space) are a bit limited.
But again, you have to know what you're doing in order to correctly configure your domain and server to accept mail, and filter spam (unless you don't mind lots of spam), and preferably set up your domain records so that others are less likely to flag *your* e-mail incorrectly as spam.
I guess that I feel a little sad for you then.
Don't be. I've done it, and it was fun for a little while, but now I have bigger fish to fry than fretting over ASCII-only e-mail. If that's what you like though, and choose to expend the effort to continue along that vein, then more power to you.