MX records #1-4 is postini and we had MX #5 as our Exchange 2007 mail server. MX records only control inbound email. Outbound email will use A host records and PTR records so removing MX #5 will not cause any problems with mail flow.
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MX records #1-4 is postini and we had MX #5 as our Exchange 2007 mail server. MX records only control inbound email. Outbound email will use A host records and PTR records so removing MX #5 will not cause any problems with mail flow.