Why do I need DKIM?
DKIM helps you in two ways - when you're sending emails and when you're
receiving emails.
When you send an email DKIM adds an
invisible signature that can be used by the receiver's email provider to
validate your email. This means that your email is less likely to be
accidentally flagged as spam. It also means that you can protect your domain
against malicious emails that claim to be sent on your behalf.
When you receive emails the mail servers
automatically check if the email that is sent to you is using a digital
signature to verify itself. If not, the emails will in most cases be flagged as
spam. This is one way to protect you against spam emails, spoofing and phishing
attacks.

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