Which mail client do you use?

Hello fellow linuxadmins

I use Icedove. But it's bugging me that its using up all CPU on a single core. It gets slow and sometimes wont close or send an email when i press the buttons. I tried every trick i could find on google, some seems to bring the cpu usage of Icedove down, but not enough, it's still laggy.

So now i'm on the lookout for a new mail client to use, and was wondering which ones you think are good and use every day?

I use my mail client for a "lot" of account. At the moment 6 with IMAP access, will be more in the future. It must be able to run on linux. Terminal based clients are okay too