I'm used to claws-mail, so I'm using it daily. But I think it's quite terrible -- there are regular delays every minute for a couple of seconds and in that period, most buttons on the UI are disabled. I think that whenever it does something with IMAP most of the functionality is locked. Also I think it doesn't implement IMAP push and it has to poll for new mail every minute.

Also opening a mail that's 30 MiB in size (pictures) and has to be downloaded just freezes the entire UI.

I'd like to advise people to use other software, but I don't know of any perfect email clients:

* sylpheed/claws-mail has this locked UI problem

* mutt doesn't render images and has a steep learning curve

* thunderbird has software bloat, doesn't work on my low end hardware

And other recommendations?

Webmail is also mostly broken. I liked prayer, but it also doesn't render images IIRC and roundcube dropped the classic theme on new versions, and the new theme has less information density.

I like the classic HTML UI of GMail and OWA, though.