Phishing emails are one of the biggest security threads at the moment. Every year, they are getting better and it is getting harder to block them up front.
Features like SPF, DKIM, and DMARC do a good job in preventing most phishing emails, but they are not enough.
External email tagging is another security layer, that appeals directly to the user.
This short guide explains step by step how to setup external sender banner in Outlook.
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