Christopher Rüprich writes:
> That's fine, but this is neither here, nor there. If the DNS lookup > failed, you don't know whether the domain has MX records, or not. There is a difference between a failed DNS-lookup and an empty result.
I know that.
I'm pretty sure, in this case the DNS lookup did not fail, but return an empty result:
How do you know that, for a fact?Searching my trash folder, with about 800 messages in them, I found six instances where one of the three SPF lookups done for each message failed, and the two others worked, over the course of last 30 days.
Transient DNS lookup failures are a fact of life.
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