- Plesk for Windows
Emails sent to a mailbox that is hosted on a Plesk server are rejected with the following error:
CONFIG_TEXT: 550 5.0.350 Remote server returned an error ->
551 This mail server requires authentication before sending mail from a locally hosted domain. Please reconfigure your mail client to authenticate before sending mail.
Email was sent from a user who did not authenticate before sending mail, but MailEnable rejects non-authenticated connections.
- Connect to the server via RDP
- Go to MailEnable > Servers > localhost > Services and Connectors > right click on SMTP > Properties:
- Open Security > Address spoofing > set to Anyone can spoof sender address:
- Try sending email again. If it does not help, check the following articles:
Unable to send emails to a particular domain: 551 This mail server requires authentication before sending mail from a locally hosted domain