Invalid character in email address domain causes error "SMTP Sender: no recipients, email send ignored. The value in the recipient is not a valid email"Issue You will identify this issue by observing the below error message in an email log when troubleshooting why a user did not receive an expected notification. The email will have the state Send-Ignored with the error string: [code]<pre><code>SMTPSender: no recipients, email send ignored. The value in the recipient is not a valid email 'name@name_domain.xxx'<br/></code></pre>[/code]CauseAs per section 3.4 of the Internet Message Format Standard RFC5322, the _ (underscore) is an illegal character in the address domain, so JavaMail rejects the address.ResolutionThis is not a ServiceNow platform issue, as the behaviour is expected. In order to resolve this, the domain part of the email address needs to be corrected to conform with section 3.4 of Internet Message Format Standard RFC5322.