Secure e-mail - SPF, DMARC and DKIM
The main email sender verification mechanisms in use today are SPF, DMARC, and DKIM. If an organization does not implement them, it exposes itself to significant risks. This gives cybercriminals the opportunity to send fraudulent messages, allowing them to impersonate any sender within the organization’s domain. For this reason, some email providers treat incoming emails from domains that do not use these mechanisms as spam.