A good security practice for email are:
The word "email security" refers to various processes and strategies for defending email accounts, information, and communications from unwanted access, theft, etc. Spam, as well as phishing, and other types of attacks are frequently disseminated by email.
Therefore, Relying on your built-in security could expose your company to cybercriminals who frequently take advantage of the number one attack vector: taking advantage of human nature and lax security.
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