On Thu, May 6, 2021 at 5:02 PM Douglas Foster < dougfoster.emailstanda...@gmail.com> wrote:
> I have begun data collection on the effectiveness of the MX and A tests. > Wildcard DNS entries increase the frequency of false positives and reduce > the usability of the test. For example, "msaqq189.ford.com" returns a > set of MX results, but I rather doubt that I made a lucky guess and found a > mail domain that Ford Motor actually uses. > There's no need to guess. You can query for wildcard records: $ host -t mx '*.ford.com' *.ford.com mail is handled by 10 cluster4.us.messagelabs.com. *.ford.com mail is handled by 20 cluster4a.us.messagelabs.com. -MSK
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