Message for macOS automatically check and correct spelling mistakes while you're typing. It is a handy feature, but it's more of a nuisance for someone like me who doesn't always type in perfect English on purpose. Even more so is for those who communicate via other English or Roman alphabet-based languages.

Autocorrect for Message in macOS can be disabled from Finder's configuration menu.

Steps to disable autocorrect for Message in macOS:

  1. Click on Edit at the Message menu.
  2. Click on Spelling and Grammar option.
  3. Click on Correct Spelling Automatically to remove the tick mark.