If you have your own mail server and view your mail locally on a client like thunderbird, you can’t really view your mail on any machine in which you don’t want to be installing an email client on or one that isn’t yours. Are there any self-hosted webmail options in which you can log into your email on any machine without using a 3rd party service?
I use SnappyMail. It’s a fork of Rainloop that’s actually maintained.
https://github.com/the-djmaze/snappymail
And unlike Rainloop, the Sieve filter editor actually works.
There is a guide in the Mail cow docs on integrating Roundcube, that’s the client I use for my stack.
I use RoundCube, I think it’s one of the oldest solutions out there, and is pretty good (and not ugly as of a few years ago).
Other people already mentioned Roundcube and Snappymail, which are good options already.
There’s also Cypht if you want a different approach. It combines multiple accounts into same interface so you can have a unified inbox.
I use roundcube.
In case you already have Nextcloud, there is an E-Mail client app for it.
There’s squirrelmail.
The usual ones are RoundCube and SnappyMail (which is a fork of deprecated RainLoop). I’m hosting SnappyMail to access my Dovecot when no other mail client is handy.
@Charlxmagne @selfhosted I use Sogo along mailcow and it is the nicest I’ve seen.
Sogo seems to be a whole groupware, i.e. including a mail server, calendar, etc…
I understand that OP is looking for a mail client only.
@mbirth @selfhosted that’s true, but it is also way nicer than squirrel or roundcube
To make it seamless so you can still Thunderbird, someone made a Docker image of it here: https://hub.docker.com/r/kebles/wanderbird But, you can probably find a newer release somewhere newer than 4 yrs old like this one. :) The point is, if you are wanting to keep it in the Thunderbird umbrella, then it’s most likely been Dockerized.
I’ve Tried Cypht recently, but if you are using Gmail, it has a conflict there so it won’t work out of the box without some extra work I think.
I liked zimbra the time I used it but it is rather heavyweight complete collaboration suite.