A diligent user have alerted us to the fact that the server’s time is incorrect. As a result email delivery times may have appeared incorrect in email programs.
When we set up the new server WWW-30 a couple of weeks ago, we seem to have forgotten to configure regularly synchronisation with a time server. When you leave a computer running for an extended period of time (as you would do with a web server), then the time tends to drift away from the correct value. A synchronisation with a trusted time server is therefore necessary every now and then.
We have fixed the issue and it will remain fixed!