Is the existence of an A record or MX record the only thing that the "helovalid" test type checks for?
Correct -- because those are the only two correct ways to do it. It *should* have an A record; if not, though, most people consider an MX record to be acceptable.
I, perhaps wrongly, assumed that it checked the format of the HELO string looking for a Fully-Qualified Domain Name. For example, "OEMCOMPUTER" would fail the test because it didn't have a TLD. But perhaps all along the test has just been looking for the existence of an MX or A record and if it doesn't find it then it tests fails. If an MX or A record does exist are there any other things the "helovalid" test type looks for?
It just looks for the MX/A records.
-Scott
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