If I understand this correctly, the drawback with this work-around, compared with the MAILFROM test, is that it only looks up the A record and doesn't check for any MX records.
True. It's designed to work with the MAILFROM test. The MAILFROM test works properly, and works with most TLDs. The VERISCAM test works just with .com and .net domains. The MX record test is not necessary with the VERISCAM test (if the A record is 64.94.110.11, the domain doesn't exist, and therefore can't have an MX record).
Any idea if this will cause a number of false positives?
Only for domains that point to sitefinder.verisign.com -- but if that is the case, they probably aren't a domain that you would want mail from. :)
-Scott
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