Email shield - Understanding Alerts

Below is a Glossary of Alert Messages that appear in Email Shield

1. Failed the DomainKeys Identified Mail (DKIM) check - DomainKeys Identified Mail (DKIM) helps prevent spoofing, email spoofing is when an email's content is changed to make the message appear from someone or somewhere other than the actual source. Spoofing is a common unauthorized use of email, so some email servers require DKIM to prevent email spoofing. DKIM is there to prevent that via encryption.
2. Failed the Domain-based Message Authentication, Reporting & Conformance (DMARC) check - DMARC helps mail administrators prevent hackers and other attackers from spoofing their organization and domain. A failed check means that messages that aren't authenticated might be impersonating your organization, or might be sent from unauthorized servers.
3. Failed the Sender Policy Framework (SPF) check - The Sender Policy Framework (SPF) is an email-authentication technique which is used to prevent spammers from sending messages on behalf of your domain.
4. The site ahead may contain harmful programs - Attackers might attempt to trick you into installing programs that harm your browsing experience
5. Visiting this web site may harm your computer - This page appears to contain malicious code that could be downloaded to your computer without your consent.
6. Deceptive site ahead - Attackers on this site may trick you into doing something dangerous i.e installing software or revealing your personal information (passwords, phone numbers, or credit cards).