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# Prefer IPv6 over IPv4 addresses exim -bt x@46.test.ex **** exim -bt x@mx46.test.ex **** exim -bt x@mx246.test.ex **** exim -bt x@mx4646.test.ex **** exim -bt x@mx46466.test.ex **** exim -bt x@mx46466b.test.ex ****