Not able to send mail from discourse server

Getting the following error. Please help us to setup this.

535 5.7.8 Error: authentication failed: authentication failure
mailer user name passwords are correct. even though we are getting this error.

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Have you followed the steps in Troubleshooting email on a new Discourse install ?

If you want to get help you’ll need to provide more details on what you have tried, what guide you used to setup your server, and any relevant configuration settings.

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What SMTP provider are you using?