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Just in case, there are alternative e-mail clients. Leaving aside command-line ones, there are at least these:
ports.macports.org
ports.macports.org
(I am also trying to get Trojita into Macports, but not sure at the moment its Qt4-based version is usable.)
P. S. If anyone knows Qt4-based e-mail clients which work, ping me, we can trying those.
Install claws-mail on macOS with MacPorts
Install sylpheed on macOS with MacPorts
(I am also trying to get Trojita into Macports, but not sure at the moment its Qt4-based version is usable.)
P. S. If anyone knows Qt4-based e-mail clients which work, ping me, we can trying those.
Resurrecting this post in 2025! I am using the Apple Mail app on my PowerBook G4 running Leopard. A few years ago I ran it though Leopard Webkit to update the certificates etc and it works fine on Gmail if I use an app password. Recently, I tried to add my Hotmail back on and I can't get it to work at all, even with app passwords. I use this Hotmail address with Thunderbird etc without problems. Has anyone managed to get Outlook emails to work with this recently and if so, what settings did you use?
iCloud email works with an app specific password. I don't know of any others that work.
The releases appear to be mirrored here: https://mirrors.dotsrc.org/osdn/tenfourbird/, with the latest version (38.9.0) located in the 66176 directory.
There are two issues with connecting older e-mail programs to Outlook.com:
(1) You need modern TLS to connect to Outlook.com, which my proxy program could help to fill the gap; however, with Outlook.com specifically, there's another issue....
(2) As of early this year, Outlook.com moved from using standard username/password authentication to using OAUTH 2.0 and as far as I'm aware there isn't an "app password" workaround like Gmail, yet. OAUTH 2.0 would need to be handled in the e-mail client, and it wasn't added to Thunderbird until version 77 (TenFourBird is based on Thunderbird 38).
Fortunately, OS X is Unix at its core, and so there are almost certainly good unix e-mail programs out there which support OAUTH 2.0 and could work on OS X. I would try one of the two @barracuda156 posted above, and note that he has a special fork of MacPorts for PowerPC, which would be the first place I'd look to get it working on your computer - https://github.com/barracuda156/powerpc-ports
If it helps, I looked at the first (Claws Mail) which looks promising - https://www.claws-mail.org/faq/index.php/Oauth2
(1) You need modern TLS to connect to Outlook.com, which my proxy program could help to fill the gap; however, with Outlook.com specifically, there's another issue....
(2) As of early this year, Outlook.com moved from using standard username/password authentication to using OAUTH 2.0 and as far as I'm aware there isn't an "app password" workaround like Gmail, yet. OAUTH 2.0 would need to be handled in the e-mail client, and it wasn't added to Thunderbird until version 77 (TenFourBird is based on Thunderbird 38).
Fortunately, OS X is Unix at its core, and so there are almost certainly good unix e-mail programs out there which support OAUTH 2.0 and could work on OS X. I would try one of the two @barracuda156 posted above, and note that he has a special fork of MacPorts for PowerPC, which would be the first place I'd look to get it working on your computer - https://github.com/barracuda156/powerpc-ports
If it helps, I looked at the first (Claws Mail) which looks promising - https://www.claws-mail.org/faq/index.php/Oauth2
Of what is known to build, at least claws-mail and nmail do work.
I think that sylpheed will work, but MacPorts for w/e reason does not enable encryption in it by default. I noticed that recently, fixed in my fork, but did not have a chance to verify if the app is useful now.
There are also rb-sup (CLI in Ruby) and mutt, they build, but I did not try using them.
I had hopes that trojita will work (it is Qt-based, so no X server dependency), but unfortunately there is something wrong with its Qt4 version, it does not find database plugin at startup, and the app does not let an account to be set up. KDE4 mail apps are broken, crashing on launch (as many KDE4 apps). Or maybe I do not know how to set KDE4 up correctly (but some KDE4 apps work normally – not that everything is just broken).
P. S. If someone knows Qt4-based client which is not KDE4-related, let me know. I would likely prefer that to GTK.