What software do you use to aggregate email in a single interface?

Thunderbird

Same

I use Thunderbird.

Sometimes you just cant beat the classics.
- Especially when the classic Thunderbird was just overhauled with modern UI

Thunderbird - on my PC and Mobile... Always worked flawlessly - both with my different mail-services and my own domain name mail server...

KMAIL

Thunderbird.

It is the worst email client besides all the alternatives

I like Betterbird, I find it slightly more less worst.

Thunderbird since forever. Before that, Seamonkey and the Mozilla suite.

There are some changes I didn't like over the years like the tabbed interface for everything, but nothing else ever came along that worked as well and was multi-platform.

I don't. That's the entire point about having different mailboxes in the first place : they stay isolated and I manage notifications (or not) exactly how I want, when I want.

Betterbird

ArcaneChat on mobile

what is this, is it anything like Delta Chat? (i.e. the UI of a chat app but using email for sending/receiving messages)
I've been trying out Delta Chat for messaging my family. It's a bit kludgy and messy though, at least when interacting with others who are using regular email clients. For instance, it sometimes sends multiple emails rather than bundling it up as one.
- Cool cuban dev adds features that generally come to delta chat shortly afterward
- fork in close relation with DeltaChat!
  cleans up some cludge for some smoothness instead :3
  maybe those issues you're having will go away after some bug reporting? /genuine encouragement, neutral tone
Bröther...
Does it work for gmail, yahoo, etc ?
- stop using those oppressive email providers already??
  idk if those billionare monopolies let you use IMAP & POP
  try anything else- like StartMail, from dutch GDPR championing StartPage organization
- Easiest way is use Tuta as a backup email for an IMAP-compatible email provider working with Delta. That way you don't need any real phone #s or emails and nothing links back to one identity
  https://providers.delta.chat/

I use FairEmail on phone and Sylpheed on desktop.

fairmail on phone, postbox on pc

Thunderbird. I even use Thunderbird as my RSS reader too.

Off-topic: For RSS feed, you might want to have a look at Miniflux[1] if your also into self-hosting.
[1] https://github.com/miniflux/v2

I used to use Thunderbird, but their PGP integration always crashed the whole program. I now use Evolution.

Interesting, GPG has been working just fine for me so far.
My main issue with it remains that barely anyone else uses GPG.
PGP integration? Thunderbird has in-built support for PGP, isn't it?
BTW, most of my incoming emails are routed (and encrypted) via addy.io and never faced any issue in opening encrypted (and signed) emails in Thunderbird.
- Not for smartcards

Good ol Thunderbird

aerc

Þis is þe way.
I use msync and notmuch, to provide Google-like tagging and searching, and to keep a local email cache so it's faster, but aerc supports boþ notmuch and IMAP, so you get boþ.
- I'm almost disappointed to learn you don't use Þunderbird.
- I really respect your comittment to using þorns here, even though it means people probably down vote you because they don't know what's going on.
  Just wanted to let you know. Keep it up :)

How about isync + notmuch + afew + alot + msmtp? gpg decryption not directly supported but using alot's pipeto it can be used to decrypt messages. As using notmuch as indexer it's flow is pretty similar/compatible to/with gmail.

Do you really use all of those? I don't see the point in using so many tools when there are many standalone programs that can accomplish the same task.
- It depends on your preferences of course. Notmuch offers a way fast indexer you can't get with traditional gui applications, but by itself it's not pretty useful, however the integration with other tools makes it really powerful, with afew you get your personal tagging when messages arrive (filters), with alot you just get the email frontend. If you like the terminal experience, then you'd know you need something extra for smtp (writing emails) and there you have for example msmtp. It's a matter of choice. I mentioned notmuch since the traditional approach to the terminal is plain neomutt, but there are alternatives. isync (mbsync) actually interacts well with neomutt but it also does it with notmuch, and neomutt can be used as a frontend for notmuch as well. A matter of choices.
  The thing with solutions like thunderbird is that you have to adhere to their design decisions. For example I don't like their librnp implementation, and I had to create alpm hooks on artix to keep updating such library with sequoia-octopus-librnp, not because I like rust (I don't dislike it either), but because at least I can keep just one keyring, and thunderbird when not having a master password (the default) keeps its keyring unencrypted, and I pretty much see no reason not to use gnupg. So I decided I better kept using gnupg's keyring and stuff. Integrating different tools designed for specific purposes you have more freedom of choice. At any rate that's how unix was conceived, and you can choose to do it that way if you want.
- unix philosophy

Betterbird

why is your name red?
- Bcs i'm a server admin on dbzer0

As a Gnome/GTK enthusiast, I really love Geary. I think it’s the email client that integrates best with the Gnome environment!

Geary is very polished and shiny. I ended up not using it because I have a lot of folders, automatic rules to sort things, different signatures and addresses and some of the advanced email stuff isn't in there. But definitely worth a look for someone with a simpler private email inbox. And so much more intuitive to use than for example Thunderbird.
- Same! Geary is really nice, especially if you're trying to spend less time on the internet. It does one thing, really well: read and write emails.
  Unfortunately I'm not ready to simplify my life like that I guess.

Evolution.

seamonkey and thunderbird are both good

Thunderbird and neomutt.

aerc+mbsync+notmuch

If you want a GUI, I was using Evolution before aerc and I was happy with it. I just prefer keyboard navigation which naturally is well supported by any TUI application.

I use mutt

Kmail on Android, Evolution on laptop.

Evo is a little clunky looking but it integrates calendar, contacts, and does PGP seamlessly using Gnome's key manager.

Evolution being just a little bit clunky is a massive improvement from the Gnome 2 and early Gnome 3 days, for what it's worth.

claws ☞ https://www.claws-mail.org/

I use AERC. TUI that is just so painfully easy to use. integrates with whatever editor you use like vim or emacs or whatever. Account setup is a breeze via a config file thus making it easy to backup. I have it in my nix config so whenever I take my nixos anywhere or reinstall it I instantly have my email ready to go.

Also Thunderbird, but specifically the Betterbird fork.

It works well, its fast, its lightweight (like 100-200MB of RAM), and has lots of features.

I also have my calendar in it.

I like evolution a lot

Came to say this. I was a Thunderbird user like we all but it started to annoy me with tabs and too many features. I gave Evolutiona a try and haven't looked back since. It's as simple and solid as the Email protocol, with build in contacts, tasks and calendar. I'm managing a hand full of email addresses with it, it's responsive, no bells nor whistles, perfect for me!

Any halfway decent desktop email client will do the job—people have already listed several. I use claws-mail, but getting it to work with GMail involves the computer equivalent of doing a triple backflip through a hoop, so you may want to go with something more common.

I use Mailspring. Thunderbird was crashing a lot for me a few months ago but I had used TB for a long time so I will probably move back to it soon.

Thunderbird

At this point I'm thinking of creating my own client haha.

I believe MailSpring is really powerful. But some advanced features are behind a pro account. MailSpring itself is open source.

I've tried Vivaldi mail. Might be something for you, but I just didn't like the UI so I'm also still using the web interface for each. Looking forward to seeing others answer as well.

Vivaldi is great IF you don't use the web UI. outside of that it's fast and decent. I still use my Vivaldi email account from when I used to use the browser. now I just use it in aerc as a sort of 'junk drawer' email.