mail server requires authentication

If you are getting below error then you can resolve this error by following below steps: 550 This mail server requires authentication (0) when attempting to send via this SMTP (submission) port The main reason of this error is if we configured mailenable to force all inbound connections to...

Introduction: 503 is an error in which the mail server requires authentication while sending emails to non local regions and external email addresses. This error usually occurs when the users try to send email to external email addresses. The sent email will get barred if any one of the email...