What are DKIM & SPF Email Authentication?

DKIM & SPF email authentication features provide information about outgoing messages. This helps the receiving server verify that the email is coming from a trusted sender.
 
Set up DKIM
DKIM helps verify the sender and integrity of a message. It allows an email system to prove that a message was not altered during transit (meaning it is not forged), and that the message came from the specified domain.
 
Set up SPF
This function attempts to prevent spammers from sending email while forging your domain’s name as the sender (spoofing). This authentication function works by adding IP addresses to a list, specifying computers that are authorized to send mail from your domain(s). It verifies that messages sent from your domain(s) are coming from the listed server, reducing the amount of backscatter you receive.
 
Advanced Settings
This section includes a number of ways to configure SPF authentication. The available options are:
Additional Hosts that send mail for your domains (A): The additional hosts specified here are automatically approved to send mail from your domain(s). You may add and remove hosts using the appropriate buttons.
Additional MX servers for your domains (MX): MX entries specified here are able to send mail from your domain(s).
Additional Ip blocks for your domains (IP4): IP addresses approved to send mail from your domain(s). Your server's main IP address is automatically included in this list. If you add IP addresses, you must use CIDR notation. (Example: 192.168.0.1/32)
Include List (INCLUDE): This feature allows you to specify additional hosts to include in your SPF settings. This is useful when sending mail with another service.
All Entry (ALL): If you enable this option, the SPF feature causes hosts that are not defined in the above lists to fail. If you disable this option, the SPF feature will not cause undefined hosts to automatically fail; instead, undefined hosts will be marked as Neutral. When a server receives mail from a neutral host, the server will act as if SPF was not enabled. Once you have tested the entries in the above lists and confirmed that they are correct, you should enable this feature.
Overwrite Existing Entries: If you select this option, the system will overwrite existing SPF entries.
Click Update to save your changes.

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