Thunderbird on OpenSUSE

Tuta's web client.

It gets the job done and I don't use email much any more.

Betterbird, a Thunderbird fork and I installed it from AUR repo but it has a flatpak version too

Betterbird (Thunderbird fork) for pc, K-9 for phone.

Evolution, Thunderbird and KMail, depending on the system. Though I've had only trouble with Thunderbird and gpg signing with a yubikey. The others just work.

On Android I'm using FairMail.

Def proton mail. I was using spark for my other accounts and it was pretty good. Then i got a new phone and never downloaded it agIn and i use the stock ios app.

Betterbird

Trying to get the hang of meli on my laptop & K-9 on (unGoogled) Android

Protonmail web client and Android app tbh

For work it's obviously outlook

Thunderbird and K-9 (which will soon be Thunderbird mobile). I'm not a Thunderbird Stan or anything, but I was running into issues with Claws, Seamonkey, and Fairmail

alpine

I'm using Thunderbird.

On my work computers, I don't want the email to be stored locally since they back up the entire system to the cloud for retention and compliance purposes, so I'm using Roundcube (webmail app) hosted on the email server itself. I self-host my email server.

I was using Thunderbird, but I have had a number of issues with it. Crashing seems to happen whether I use the Flatpak or install from AUR.

I have switched back to using web clients for my mail for the time being.

I use super boring Claws Mail for my personal email. I handle my contacts with Khard and calendars with Khal.

I don't use a Yubikey though.

I'm lazy - just gmail pinned in a tab on my browser on my Linux desktop, the browser is always open anyway. Default mail client on iOS/iPadOS.

I've used Thunderbird in the past. The redesign was nice but it's still a bit cludgy to use somehow, compared to gmail web.

aerc with mbsync and msmtp and neovim for composing

I guess the question is, why do you need a client? I find most web interfaces to be sufficient, you can enable browser notifications, create an "app" so that it's in a stand-alone window, etc.

As another comment said, I just use the Proton web interface.

I’m using Evolution on Arch and Debian and works just fine for me.

If anyone knows a client that can snooze mail on Proton and Gmail, I’d love to know about it. Until then I’m stuck using the web interfaces and their official phone apps.

Mailspring, best client I've used in a while.

mu4e+mbsync+msmtp

SeaMonkey.

Don't know if this has been said but you are not supposed to use the yubikey on your mail client. Google recommends you use an application password for email clients. As someone who has 5 yubikeys for different services I know this sounds unsafe but is the only way I've been able to use some of the mail programs with Google. The other option would be to enable another 2fa (maybe auth codes with Yubico Authenticator) and use that on the mail programs.

For Google I ended up using web client and fido2 (and another yubikey as backup and another as auth code generator) and my work requires Outlook but they also ask me to change passwords each month and input them on different platforms that don't support f2 and that breaks a few things for me so I opted for Yubico Auth and use my yubikey instead of Microsoft Authenticator or Google Authenticator.

Thunderbird is very nice and lightweight compared with outlook. Picks up email settings more quicker and is much simpler to use than outlook. Recommended to all my clients.

I know it's not an answer you expect but I just use the official web client. I hate how there's 2+ sidebars and a lot of features I don't need in standalone clients. I just need inbox, spam, trash and probably search.

A combination of thunderbird and mutt.

And bluemail on android...

The webmail interface and the app of my email provider (Tuta).