You may be receiving the message "ML-0016 - Recipient Error" because the email address of the person you were trying to send an email message to was typed incorrectly, or there is something wrong with the domain you are sending the email to. The domain is the part of the email address after the at (@) symbol.

Check the Spelling

You will need to check the spelling of the email address to make sure it was entered correctly. If it was entered correctly and you are still having trouble sending email to that person, you will need to check with the recipient to see if they are having issues with their email domain.