spoofing is fairly common and is used legitimately, but is also a prime way for malicious actors to phish users. have a read of this if you're not across the details of how to protect your domain. Of course this doesn't help you much if you don't own the mail domain that is being spoofed. Defender for O365 can help if that's an option https://cyberpanel.net/blog/spf-dkim-dmarc/
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ElieAT (Iron Contributor)
spoofing is fairly common and is used legitimately, but is also a prime way for malicious actors to phish users. have a read of this if you're not across the details of how to protect your domain. Of course this doesn't help you much if you don't own the mail domain that is being spoofed. Defender for O365 can help if that's an option https://cyberpanel.net/blog/spf-dkim-dmarc/