The former may not be especially mainstream, but anyone who ignores the latter category (not to mention my blind friend's screen reader) does so at their peril.
I was wondering how long it would be before someone brought up the case for Lynx. Blind people I had not though about, although I had thought about text based reverse turing tests.
I know nothing of this GoWeb 6 that you speak of, youll have to describe it to me, but I assume its some kind of transcoding browser that doesnt handle images very well.
So one solution would be to have both public and private archives. The public archives have the email addresses obfuscated in some way, the private archives would not.
List members, and those able to pass a reverse turing test, would have access to the private archives, while the rest of the world would have access to the public archives.
Once we are talking about both public are private archives, however, we are probably also talking about the use of a cgi script which renders emails on the fly, depending on some kind of authentication. A cookie, perhaps.