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Magento 2 SMTP
Read this step-by-step guide to add SMTP extension https://www.elightwalk.com/docs/magento/smtp
You can go to configuration and click on the test email smtp; from here, you can test the email.
Yes, in the general setting of SMTP, you will get a blacklist emails section where you can add email addresses you want to blacklist by separating them with a comma.
This extension allows you with different hosting providers such as Gmail, Sendinblue, Outlook, Smtp2go, sendgrid, etc.