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"The lookup first attempts to locate an MX record associated with the name. ... If one or more MX RRs are found for a given name, SMTP systems MUST NOT utilize any A RRs associated with that name unless they are located using the MX RRs..."
You're right, I mis-remembered that part and got it backward. Though, I'm not sure that it matters if all you're doing is checking to see if an e-mail domain is valid -- if any of them is good, it's valid. If you have to actually deliver the mail, of course, is where my bad memory would become important... :)
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