I've contemplated this for a while, and I don't really have any solutions to offer, here's a few thoughts:
Most of the older mail clients do not support SHA(anything) SSL certificates, which most people have moved to since MD5 based certs are old, and there's evidence they have been compromised. So, you might encounter some difficulties there.
The web browser situation is pretty abysmal and I really think it's not particularly reasonable to attempt to solve. However, most of the major web services provide web api to access them, and the web3.0 model or whatever is native client side apps on mobile devices with the web interface being kind of secondary. So it's somewhat reasonable to create native macos apps for these services using their web apis, and have an actual usable client side experience. The hiccup there is lack of infrastructure like ssl, oauth, etc. Nothing impossible, just tedious.
I've considered doing a client for accessing 68kmla this way, but I don't believe phpbb has any real API to speak of, and scraping the HTML would be tiresome and error prone. Some alternative forums use software that bridge the forum to NNTP, so you can use your favorite usenet client to read/post, which is nice.
MacSSH still works, although again doesn't support some of the newer encryption, so it might not work with some of the more strict servers that have disabled legacy enc types.
Another option is using X11 and remote displaying modern apps on the macos system. Unfortunately, I haven't found an X11 implementation for macos that supports higher color depths. Combine that with newer unixy apps only working with 24bit or so, and a lot of apps won't display. For instance, I have yet to find a modernish X11 browser on any platform that supports 8bit color.
VNC is always an option, although not a great one. Modern resolutions can be hard on 68k vnc clients. I've experienced frequent client crashes in almost every client out there. When the client is working, the resolution of most macos systems is so low as to make modern UI not very pleasant to use.
Most of the older mail clients do not support SHA(anything) SSL certificates, which most people have moved to since MD5 based certs are old, and there's evidence they have been compromised. So, you might encounter some difficulties there.
The web browser situation is pretty abysmal and I really think it's not particularly reasonable to attempt to solve. However, most of the major web services provide web api to access them, and the web3.0 model or whatever is native client side apps on mobile devices with the web interface being kind of secondary. So it's somewhat reasonable to create native macos apps for these services using their web apis, and have an actual usable client side experience. The hiccup there is lack of infrastructure like ssl, oauth, etc. Nothing impossible, just tedious.
I've considered doing a client for accessing 68kmla this way, but I don't believe phpbb has any real API to speak of, and scraping the HTML would be tiresome and error prone. Some alternative forums use software that bridge the forum to NNTP, so you can use your favorite usenet client to read/post, which is nice.
MacSSH still works, although again doesn't support some of the newer encryption, so it might not work with some of the more strict servers that have disabled legacy enc types.
Another option is using X11 and remote displaying modern apps on the macos system. Unfortunately, I haven't found an X11 implementation for macos that supports higher color depths. Combine that with newer unixy apps only working with 24bit or so, and a lot of apps won't display. For instance, I have yet to find a modernish X11 browser on any platform that supports 8bit color.
VNC is always an option, although not a great one. Modern resolutions can be hard on 68k vnc clients. I've experienced frequent client crashes in almost every client out there. When the client is working, the resolution of most macos systems is so low as to make modern UI not very pleasant to use.