While messaging apps may have become more popular over the last ten or so years, email remains an important method of communication, particularly for business. Despite its common use, there are many security problems associated with regular email:
False messages are a significant threat, particularly when it comes to business and legal issues. Imagine someone else sends an email from your account – how can you prove it wasn’t you? There are many viruses that spread in this way, and with regular email, there is no concrete way to tell whether a message is false or not.
Normal emails can also be modified by anyone with system-administrator access to the SMTP servers that your emails pass through. They can alter or completely delete the message, and your recipient has no way of knowing if the message has been tampered with or not.
In the same way, messages can be saved by the SMTP system administrator, then altered and sent again at a later time. This means that subsequent messages may appear valid, even if they are actually just copies that have been faked.
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