Some general diagnostic and health checking advice appreciated please. Yesterday my mail server became unavailable due to the dns service being stopped - it would not resolve internet hostnames. i rebooted and server was ok. Later the same day my other email server (different domain) became unavailable also. I was unable to do any detailed diagnosis (phone login) so just rebooted and it was fine. 2 questions stem from this:
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is there a basic method to follow for diagnosing faults on a linux server - im slightly overwhelmed by the number of logs and am looking for some clever starting points! My main concern is that the system has been violated by an intruder
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is there a method for building a secondary mail server for each domain (there must be!). I assume it uses the same accounts provider but am not sure what “mail” config is required to make this work
thanks in advance