[jameshiew]

Since you mention Mail/Messages, I assume you are on macOS. I had a similar issue - wanting to always open links from Slack in Chrome, but links from elsewhere in Brave. I use Choosy[1] which works well for me, but there look to also be some free/libre alternatives, like Browserosaurus[2] (which I've never tried).

[1]: https://www.choosyosx.com/

[2]: https://github.com/will-stone/browserosaurus

[gnicholas]

Nice, thanks! As I think about this, it seems like it might be best solved at the browser level, and perhaps a privacy-oriented browser like Brave would enable an external-links-in-incognito setting.