Select report junk on the menu in the upper right- that should open options at the bottom for junk, phishing, and block sender. The first two report as junk or phishing and the last just blocks the sender.
If I simply move the email to junk will this stop future emails.
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No, you need to block sender.
Is it best to report these emails?
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You can... report junk sends a report and should move the message to the junk folder. I usually just block sender or just delete the message. Most spammers do not reuse addresses so blocking addresses don't work well.