It has been mentioned in a bug report asking for enhancement. You could add your vote to the bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1259751

I created a 'Follow-up' tag for such emails. I use the 'Quick Filter Bar' 'Tag' icon to filter only tagged emails. Then I can select to show a specific tag.

The add-on cited in the bug report, mailmindr, has a version for TB 60:

https://mailmindr.net/en/index.html

Thanks for the responses! Turns out mailmindr does the job which is great!

I may contact the developer though and offer to write some documentation as it's too hard for the average person to figure out.

And it doesn't even show up in the addon directory when searching "Snooze."

I'm on a bit of a mission help people understand that Thunderbird, with Spark for mobile, is a viable alternative to Gmail: https://lioncx.com/2019/07/26/gmail-alternative/

john76 said

I'm on a bit of a mission help people understand that Thunderbird

If you ever get the idea to help with Thunderbird documentation I for one would be grateful. I am a poor documentation writer.

I would also suggest you remove the link to the outlook calendar. That method does not work. It works for about a week and I have never had time to go back and address the issue properly.

Gmail was addressed a couple of years earlier https://thunderbirdtweaks.blogspot.com/2014/10/lightning-and-caldav.html

I would also suggest you remove the link to the outlook calendar. That method does not work. It works for about a week and I have never had time to go back and address the issue properly.

Hey Matt, thanks for the heads up. That's too bad. It's still working as of right now...

What's a calendar that works well with Lightning (not Gmail)? I'm not attached to Outlook. My intent was to get off of Gmail and since I already pay a reasonable yearly fee for the Microsoft Office apps + 1TB of backup storage, Outlook seemed like a no brainer. What do you think it would take to get your code working? It's a shame that it almost works...

I'll say a little bit more about where I'm coming from with all this. I think there needs to be a competitive solution to Gmail. I've looked around and strangely, Thunderbird is the closest of anything out there. I say strangely because it's free. I'd put Mailbird 2nd.

But Thunderbird is a little rough around the edges. I'm totally new to this community, so forgive me if this an unsavory suggestion: I think it would be cool to bundle together the TT DeepDark theme, your calendar solution for Outlook, and Mailmindr for snoozing (with a few UI tweaks) and make it available at a reasonable price. If I really had my druthers, I'd like to get all these things in the best possible shape and then start actively promoting it as an email solution.

That all comes from a place inside me that is concerned about Google and wants people to have a realistic alternative without having to sacrifice on the user experience. As it is now, I've been able to cobble together everything I want in Thunderbird, which is great, but most people wouldn't have the motivation. Google just works right out of the box.

Just thinking out loud....

You might want to take a look at the TbSync add-on, which supports many calendar providers and server systems.

My personal choice of a mail/calendar provider is GMX. There is something about that German privacy thing that makes it very appealing after dealing with the US laissez faire ideas on personal privacy.

See https://www.gmx.com/

Other than the privacy, it is just a mail and calendar service, no real bells and nothing that is not "standard" it just works.