In an attempt to send an email message via the Roundcube webmail on Plesk server, the following error is shown:
SMTP Error (454): Authentication failed.
- In an attempt to send an email message via the Horder webmail, it fails with the error below:
Server Denied Authentication
The messages like below can be found in
warning: connect to Milter service inet:127.0.0.1:12768: Connection refused
NOQUEUE: milter-reject: CONNECT from example.com[203.0.113.2]: 451 4.7.1 Service unavailable - try again later; proto=SMTP
The pc-remote service is stopped.
- Log into Plesk.
- Go to Tools & Settings > Scheduled Tasks > Add Task.
- Perform the following:
- Press the Run Now button to start the pc-remote service.