Great email client! Also, read the FAQ!

I love this email client and it appears that most of the complaints on here are from people who haven’t read the FAQ:
Slow sending with version 3? Turn off the delay.
Dislike the animations? Turn of the advanced graphics.
Want the delete key to delete the email? Change the shortcut in actions (alternatively, just press option + delete).
Problem sending emails with an imap email account? Turn off delay (this was my problem - Steven helped me on airmail support chat!)

CamKay about Airmail - Lightning Fast Email, v3.0