Polymail has native apps for Mac and iOS. This is a huge plus for me. It doesn't store mails on local disk so it doesn't spend too much space like Apple Mail or others. Tracking feature is a must for my daily work and it works perfectly. Review collected by and hosted on G2.com.

Pricing. It's a bit expensive. It would be better if it supported Gmail shortcuts. When you add multiple accounts, it lists all folders in all accounts. Would be better if it groups folders by account. Review collected by and hosted on G2.com.