Android

Twobird

On desktop I stick to the wonderful (for Gnome users, at least) @Geary.

On Android K-9 is fantastic, but regrettably I'm currently using the stock Gmail app because I had trouble setting up my Office365 work email. :(

I am with Google Workspace, so most of the time I would use the website, but if I had to use something, it would be Thunderbird on Desktop and Spark on Mobile.

Protonmail + Duckduckgo's email service, which links to a preexistent email (proton in my case) and allows you to clear trackers from emails and to use randomly generated email adresses.

Edit: only now realized that you asked for client, welp, I use proton's client, but I've been considering using thunderbird lately

I am with Google Workspace, so most of the time I would use the website, but if I had to use something, it would be Thunderbird on Desktop and Spark on Mobile.

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.

I have recently pivoted to proton..

Also using outlook. I can say for certain there are some bugs with IMAP email accounts, but other than that it has been working well for me for years.

The only thing I don't like about it (other than the IMAP bugs) is the notification sounds that are exactly the same as my work mail on PC. I get jittery whenever I hear those sounds.

Thunderbird on desktop, fairemail on android.

I use K-9 on mobile and Vivaldi on desktop.

no client - firefox containers for when I'm forced to use gsuite (work stuff) so I can keep different gmail tabs open without cross contaminating the cookies. And ProtonMail for personal (also in its own container).

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.

Gmail on mobile.

Thunderbird on the desktop. I keep TB running all the time to do filtering. Google filtering is lacking.

Work Desktop: Microsoft Outlook Work Mobile: Microsoft Outlook Home Desktop: mail.google.com Home Mobile: GMail android app

Why? Because I was on Proton personally for a long time but got frustrated with the lack of features and also my wife and I rely heavily on shared groupware stuff like calendars and reminders, so we switched back to Google Mail. Once Proton is a bit more feature-rich, we'll take a look at it again.

Thunderbird on the desktop; K-9 Mail on Android.

Spark on both Android and Win. The AI integration is surprisingly useful, albeit I think a paid feature. I also personally like the look of the clients and they are pretty fully featured.

Thunderbird. Also use it for RSS feeds.

Since google threatened to end legacy gsuite accounts I ended up migrating my email to another service (Namecheap).

Because of that I also had to use different email clients.

Desktop - emClient (prefer this to Thunderbird)

Android - Spark

Both work pretty well for me so far.

I'm clinging to BlackBerry Hub+ because unfortunately I have not yet found an alternative that does the multi inbox (+ texts, signal, ...) on the same level.

K-9

I've been using Spark and remained using it especially now that they have a desktop client it's just so clean.

TypeApp

Apple Mail on Mac and iPhone, because it’s simple and it works well.

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 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.

I'm moving to Tutanota so I have to use there client on desktop and mobile. I have Thunderbird for my Gmail and Outlook emails on Desktop and just use Gmail and Outlook apps on my phone.

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.

I use thunderbird cause I saw the new logo and thought it was cool.

Tried Fair mail and k-mail and they are ok... Liked Outlook but came back to Gmail since it can't be removed from the device anyways..

Not exactly just a client but a client and a service: HEY from 37signals (formerly Basecamp).

I've been using it for a year and a half and I really love it.