This is the error code I am getting when trying to send mail from Kmail in Linux:
Could not connect to host mail.chickxtreme.com
The message will stay in the 'outbox' folder until you either fix the problem (e.g. a broken address) or remove the message from the 'outbox' folder.
Note: Other messages will also be blocked by this message, as long as it is in the 'outbox' folder
The following transport protocol was used: