If you are getting the following error while sending emails:
"sorry, that domain isn't in my list of allowed rcpthosts" it means that you need to enable SMTP or outgoing authentication in your email client.
Please follow the instructions for your email clients available here.
Email is bouncing.
1) Please make sure the email is spelled correctly.
2) If the email you are sending to is "my name" <'firstname.lastname@example.org'> you must remove the ' (quotes) from inside the <>.