I am trying to use the send email server behavior and while it works fine on one page, it is not working on another. I am getting the message:
E-mail couldn't be sent. Error returned: Failed to add recipient: firstname.lastname@example.org [SMTP: Invalid response code received from server (code: 550, response: User does not exist to you)]. (EMAIL_FAILED)
And it is just hanging up on this one page. I'm not sure what to look for since the recipient exists - and if I send it from another page, no problem.