This looks like a pretty straightforward DNS question. I'm going to carefully review the options and think about which field would contain the header information.
Okay, I've got this. The question is asking for an action that would show the SMTP traffic rules are set up wrong. So I'm thinking the correct answer is C - successfully delivering mail from another host inside the network directly to an external contact. That would go against the documentation saying external SMTP is only allowed to/from 10.10.10.25.
Sherell
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