how to do grammar check while writing a letter or article

[Pavanbluest]

how to do grammar check while writing a letter or article

[Our Tort System]

Such grammar checks are commonly done by means of a native speaker hired for the purpose. And the service is called proofreading. =)
But you can post a letter you want to be checked here and somebody will check it for you.
_________________
If it's not easy, don't do it!
That's how I got where I am.

[Zeuslee]

Not unless your letter content is too private to be shown to the public. Try using grammar checker instead.