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lammert - 11:52 am on Feb 27, 2011 (gmt 0)
FWIW, all emails which I send are originating from another server--even on another continent--than the server specified in the MX record for those domains. Many other domains have such a setup where emails are sent via a local SMTP server but received on a central server. You should therefore look at other authenticity signals than the MX record.