[Vuejs]-Mailtrap error { Expected response code 250 but got code "550", with message "550 5.7.1 Relaying denied " }

I fixed it !

The problem was because I didn’t add the config for mailtrap in heroku app,
So I just copied mailtrap config from .env file and pasted it in my heroku app sittings under -Config Vars-
And it works !