My spellcheck doesn't work

We're building our own spellcheck. In the interim: 
Turn on the built-in spellcheck in Google Chrome. In the top bar of Chrome, click Edit, and hover your cursor over Spelling and Grammar. Make sure there is a checkmark next to Check Spelling While Typing:

To enable spellcheck on a Mac, there's a global setting you can adjust: To set an option to correct spelling automatically in all apps that support it, choose Apple menu > System Preferences, click Keyboard, then click Text. Learn more on Apple's support site.

If you're on Windows, you can manually enable spell check so that misspelled words in your compose window appear with a red line underneath. To do so, open up a new compose window and right click anywhere in the message part of the window. You’ll see something like this:

Select Spell-checker options from the menu that appears, and then select Check the spelling of text fields

Please note that there is currently an extension conflict between Mixmax and Grammarly. We hope that this will be resolved by the Grammarly team very soon!