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I use Thunderbird, but there is also Betterbird https://www.betterbird.eu
"Betterbird is a fine-tuned version of Mozilla Thunderbird, Thunderbird on steroids, if you will."
I'm not OP but I've been using Thunderbird for a bit (long-time Firefox user) and wow, Betterbird really seems to be what Thunderbird could/should be if Mozilla dedicated more resources to it. Thanks for sharing this!
 
The biggest flaw in mail for me is the fact that it needs to download your whole mailbox and can't work with say, the last 3 months locally and only hit the server if required, or give you the option to sync part of the mailbox. My work mailbox has like... 17 years of mail in it and every time I set up a new machine or need to rebuild the mailbox due to corruption (once in the past decade) its a pain in the butt to re-download it all.
I know data retention can be a touchy subject, and I mean no offense. Have you considered deleting a bulk of these messages? Or archiving them if you must keep them? I've used Nodemailer to archive some emails, although I don't recall how I did it off hand. Suppose you have files from 2010 for legal reasons, I'd personally prefer keeping them as an archive on a hard drive, compartmentalized.
 
I know data retention can be a touchy subject, and I mean no offense. Have you considered deleting a bulk of these messages? Or archiving them if you must keep them? I've used Nodemailer to archive some emails, although I don't recall how I did it off hand. Suppose you have files from 2010 for legal reasons, I'd personally prefer keeping them as an archive on a hard drive, compartmentalized.
They are archived into stub messages by our enterprise backup software.
 
I used to use alpine to check/delete email on the server, and use Thunderbird to download/archive, and send.
Now use web interface to check/delete.
 
The biggest flaw in mail for me is the fact that it needs to download your whole mailbox and can't work with say, the last 3 months locally and only hit the server if required, or give you the option to sync part of the mailbox. My work mailbox has like... 17 years of mail in it and every time I set up a new machine or need to rebuild the mailbox due to corruption (once in the past decade) its a pain in the butt to re-download it all.
Mail on iOS only downloads recent emails. You’re saying Mail on macOS doesn’t work the same way? I don’t use it so I’m asking in earnest).
 
My work mailbox has like... 17 years of mail in it and every time I set up a new machine or need to rebuild the mailbox due to corruption (once in the past decade) its a pain in the butt to re-download it all.

Ok…but really do you set up new machines that often?
 
Wow, I haven’t had to think about email programs in yeaaaarrs!

Kinda glad to see Thunderbird still is viable, loved using it on my windows machine in the 2000’s.

I remember some paid apps during the initial boom of iOS app, but it’s tough paying for an email app, but if one has specific needs….gotta do what you gotta do!
 
I'm looking for an ideal macOS email client. Does anyone have some recommendations?

Here is the list of conditions for my ideal client.
It should be.....

- able to select plain text mode always, instead of html (for both sending and receiving emails)
- simple and light (no functions such as calendar, RSS reader, AI, browser, etc)
- not sending any transmissions (including telemetry stuff) to the developer or third party companies
- able to remote access (that means you can read and delete emails on server before you actually receive them in box)
- not cloud-based
- no subscription model (free or one-off payment)

I think MailMate for Mac does everything you ask for (except maybe remote access).
 
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There used to be a mail program called Postbox. Not sure if it's still maintained.
I used to enjoy using Postbox. Keyboard shortcuts in reading mode were the killer feature for me. I only stopped using it because my employer at the time changed the Outlook/Exchange config so Postbox could no longer read mail.

It seems Postbox were recently acquired by eM Client, which is an integrated email/calendar/etc client I had never heard of. It looks potentially good, especially for a power user. Has anyone tried it?
 
Like many here, I use the default mail app. Not the best, but it works and does a decent job. Plus the continuity between my phone and iPad can't be beat. I know that's not what the OP asked for, but that's what I feel
 
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What checks off most of your boxes, but not all of them is MailMate. It is a plain text email client that uses markdown for formatting. Benny, the developer, has recently switched to a Patreon-like subscription model, but there’s also a free mode (check out the licensing terms). Very solid.

And, has been said before, Thunderbird might be the way to go. The way you don’t show the calendars is simply don’t link to a calendar when they ask you to. you can’t get rid of “events and tasks” in the menu bar, though; I’ve looked. But you can certainly hide the today pane and it’ll never show up again. You can also pick how much email you want to download.

Personally I like downloading all of my email so that if I ever get locked out of an account, I can always move my email to a different account. Like a back up.
 
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I tried Thunderbird again for about a day, and I think I would agree that for my usage MailMate is a lot better. The Correspondence view is the real reason why; it enables you to see every email you’ve either sent or received from any single email address in a collapsed threaded view.
 
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You could try Mozilla Thunderbird.

I really don't like it for many reasons, but it satisfies most of your conditions.

Thunderbird user here and really like it except that the most recent version broke customizations, so I reverted back.

I loved eudora back in the day. There is a seemingly active attempt to recreate it : https://sourceforge.net/projects/hermesmail/

This is why I chose Thunderbird years ago. Eudora was defunct and I wanted something similar.. It has the look and feel of Eudora and was being actively developed. (Yes, that boomeranged when they recently updated it and broke certain add-ons and diminished customizing!)

The reason I chose it over Mail is because you can set up rules for sorting incoming email automatically into different folders you've set up.

Makes processing e-mail far more efficient. You can attend to the messages in the crucial action folders — e.g., Banks, Family, etc. — and ignore for the while those in less pressing folders — e.g., newsgroups.

What's great is that you can set it up so that it also automatically sorts your replies, too. That way, they’re archived automatically in the right folder.
 
I just use the Proton Mail website. I just keep it pinned in my web browser.

I prefer to pay for the service and know that my privacy is respected.
 
If you use Gmail, this is what you want, https://mimestream.com/

otherwise Spark or Canary Mail on either free tier, but they got stuff you don't want on that list;

or stick with Apple Mail, it should finally get the smarter update on mac with 15.4

Man I remember buying Mimestream long long ago with the hopes that there’d be a mobile app in my lifetime. I’m on my deathbed now and my hopes have be——— 💀
 
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Man I remember buying Mimestream long long ago with the hopes that there’d be a mobile app in my lifetime. I’m on my deathbed now and my hopes have be——— 💀
haha, a mobile mimestream app would be nice for sure; supposedly its still on their roadmap. I just use the default apple one for mobile
 
haha, a mobile mimestream app would be nice for sure; supposedly its still on their roadmap. I just use the default apple one for mobile

yeah I really can't handle having different clients :D like mimestream on mac is not *so blindingly good* that i'll be okay with the dissonance of a different mobile experience. call it a pet peeve
 
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