Any good CTI sources for Email Security?

Hello, I graduated in June and had the opportunity to startas a security analyst in a company that does not shy away from investing to their security. Currently I am the main guy that deals with email security. My work generally consists of analyzing mails that the end-users think are spam or phishing attempts and then blocking the address if I find them unsafe. I am also responsible for delivering false-positive mails that the email security systems think are unsafe, …

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