I use Umuse for my email and some slack channels. It’s an elegant program and intuitive. Umuse is free and I highly recommend that you check it out. And, no...I don’t work for Umuse.

This is possibly the best Lifehacker post this year. And there are many great posts. Please post if you find an extension that works with iPhone texts. That would be phenomenal. Also, the extensions by Jason Savard (Checker plus stuff) are awesome. Thank you.