MX RRs are really very useful! We found 130994 of these records in the european database. Obviously, this represents a lot of different policies of mail routing and we found lots and lots of MX RRs pointing to unknown hosts. France is the country with less MX RRs pointing to hosts outside the country (with 0 of such MXs). This doesn't mean that all of those MXs were pointing to valid hosts. At least in 437 of these RRs a missing trailing dot is present in the name of the mail gateway.
Finally, it is also interesting to know the top 20 most popular european gateways (See Table 6).
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