There's nothing wrong with what you've described your'e doing and I can't explain what you're seeing.
You can often see the full email address of the sender when you click Reply, or sometimes you can click on the persons name in the From field and it will expand to show you the full address.
You've done the right thing to run your anti virus tools and I don't think it's worth worrying about much more unless it gets overwhelming. Others may disagree but I've had this sort of thing for years and so far as I'm aware it's not caused me any problems.
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