Email authentication ensures that the recipient can recognize the nature of each message received automatically. Enabling this feature allows you to stop the receipt of spam.
There are several ways to prevent "spoofed" mail from entering or leaving your server. The methods listed below tend to reduce the amount of bounced or unwanted emails when spammers "replicate" one or more email addresses.
Domain keys are an email authentication system that allows you to check incoming mail relative to the sending server. This method ensures that the messages actually come from the indicated server and thus makes it easier to identify false messages.
Alternatively, you can use the SPF function which gives you the ability to specify which IPs and servers are authorized to send emails to your domain.
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