Android

Either k9 or the native email client (Samsung Email, LG Email, ...) when they have a good Systemwide integration.

Patiently waiting for Thunderbird on mobile with k-9 so Gmail it is atm

• On my desktop: GNOME Evolution - but only because my university uses Outlook w/ Exchange (cringe) and the UI is slightly more tolerable than Thunderbird.
• On my phone: I just use the baked-in Samsung Mail app.

In terms of provider, I used to use Gmail for my personal, but got tired of Big G scraping my correspondence. I tried Proton, but its integration story is a complete joke (you can upload your calendar and contacts but there's no DAV support, their IMAP bridge is a non-standard-compliant dumpster fire that doesn't work with half the clients I tried...) so I ended up on Fastmail.

Protonmail connected to my domain

neomut, because I have linux brain damage

Protonmail is the way

Literally just started using k9 mail on my phone and it is amazing. It just does all of the setup for you.

gmail emails

i'm just using tutanota since they don't work with 3rd party clients

On Mobile: K-9

On Desktop: Claws Mail

It's paid (one off $15 I think), but has a two week trial but I've been using Nine for a few years now, pretty happy with it.

Been using K-9 Mail because they support OpenPGP. Also, their user interface is miles better than FairEmail's.

I've migrated from just using a gmail account to using Anonaddy which point towards a Tutanota email. The migration was PAINFUL, but glad I persisted and went through with it.

Been using mutt for years, and I still love it. But getting it to works is more and more of a pain nowadays, and I find myself using whatever webmail my company uses (right now O365). For personnal emails, mutt on the desktop, and a selfhosted roundcube for when I don't have a client.

I've probably tried every client out there and repeatedly keep exploring, but I always end back on Newton

Careful if you're using Outlook on Android. From what I've read, it doesn't actually locally handle non-exchange accounts like IMAP or POP3 (why are you using POP3 though). It's done on Microsoft's servers, so your basically giving Microsoft your e-mails. I'm not sure what kind of access they get to them from the privacy agreement you probably just clicked past.

So Outlook in Android users Microsoft servers to fetch your mail, and the client just shows whatever the server got.

Gmail. Never put much thought about it tbh

I used AquaMail for years, but they just decided that this fall they will go subscription, and old paid users who bought the app will not get all features. So, I've transitioned to the paid (one time purchase) version of Nine email app(by 9folders). It is equally capable, working with my free accounts and my O365 corporate account (including synching calendar). I looked at several open source options, and none were competent to deal with my Work O365 stuff.

I use Tutanota's clients, and enjoy it. Haven't had any issues, was a great replacement to the unencrypted privacy-invasive Gmail and Google Calendar, sorting to folders has been even more convenient

I used Aqua Mail Pro for years and it's fantastic. They're switching to a subscription model for $30/yr so I switched to Samsung email.

Big fan of outlook tbh, it works well and both on iPad and android

Web portals. I use web portals.

For Gmail users on Mac desktop, I really can’t recommend Minestream enough, if a paid app isn’t a dealbreaker. It’s designed by ex-Applers and implements gmail’s API completely— even to the point of the signature editor and vacation auto responder and having a mode that only shows unread messages and starred messages in your inbox (which is kind of a badass way to stay on top of busy mailboxes).

Used Eudora long ago. As its support dropped and Qualcomm's development of Thunderbird took off, somewhere during that I embraced the spiritual companion of Firefox. I have to use Outlook at work, that helps me not consider changing at home. Also jumped on the Gmail bandwagon back when you had to get an invite to participate. It was just a side email at the time with storage built in, but when my original ISP provider finally threatened to charge me for having an email account, I moved everything over and linked Thunderbird up to pull from Gmail.

Thunderbird. Also use it for RSS feeds.

KMail for Linux (KDE) and K-9 for Android. I used to use Thunderbird, but hit a couple of bugs that just wouldn't go away. Absolutely love KMail.

Outlook mobile seems to be the only one to give mark as read function on the galaxy watch. That's the only reason I use it.

I haven't figured out a reason to use a separate email client up to this point. I just use the webapps for Gmail and Fastmail.

K-9

I use Em Client on desktop and I love it, on android the Em Client app is still in beta and quite unstable so for now I'm using outlook. Looking at the comments I should give K9 a go.

Edit: Switched to FairEmail for Android

I actually swapped to Protonmail last night. Took awhile to change the email address on everything, but worth it. Trying out the free version for now, keeping my Gmail as a backup and for Android.