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

You can easily disable autocorrect for Message in macOS via these simple steps:

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.