Sending email through Symantec Email Security.cloud results in the following error:
553-you are trying to use me [server-#.tower-##.messagelabs.com] as a relay, but I have not been configured to let you [X.X.X.X, server.domain.com] do this.
The services is limited to our customers so we need to verify the sending server before we can accept outbound emails for relay and/or inbound emails for scanning.
clusterXout.XX.messagelabs.com (replace ‘X’ and 'XX' with appropriate values). It should generally be the same cluster as your Primary MX Records with the addition of the word 'out'.
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This will clear the history and restart the chat.