Outbound Email not working

When I tried send a email as the handbook

wp eval ‘echo wp_mail("your-email@example.com",“Hello Human”,“Hello from EasyEngine!”);’

It will display a error message

sendmail: RCPT TO:<your-email@example.com> (451 4.3.0 <your-email@example.com>: Temporary lookup failure)

Had similar issues (maybe identical? I don’t remember…) But using a 3rd party for system emails is the way to go. I’m currently using mailgun.com and haven’t looked back.