Email delivery used to be hard and take a long interval of time.
Emails sent by your hosting often end up in spam folder. (oh no!)
Thanks to newest technologies combined, now we get quality code that help speed up the email transfer process.
Among the best SMTP plugins in the world of WordPress, YaySMTP is the easiest to set up.
Demo: https://yaycommerce.com/yaysmtp-wordpress-mail-smtp/