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DKIM Authentication of Inbound Mail

DKIM (DomainKeys Identified Mail) is a method to validate the authenticity of email messages using public-key cryptography. Simply, it is a way to verify that an email sender is who they say they are. Its purpose is to prevent email spoofing.

DKIM is a development of 'DomainKeys' from Yahoo and 'Identified Internet Mail' from Cisco, hence the name DKIM.

Go to System Setup > Mail Authentication > DKIM Authentication to enable and configure DKIM authentication for inbound mail.


Author Domain Signing Practices (ADSP) is an optional extension to DKIM authentication which allows for a domain to publish the signing practices it adopts when relaying mail on behalf of associated authors. Click Enable opposite Check Author Domain Signing Practices (ADSP): to enable this extension.

IP addresses and networks can allow DKIM authentication by adding them to the DKIM Bypassed IPs/Networks list.

  • To add a list entry, click Add... and the DKIM window displays. Using the table below as a reference, complete the fields. Click Save to save this entry.

  • To edit an existing entry, click the edit ST-701-edit-button.jpg icon in the Options column and the DKIM dialog box displays. Using the table below as a reference, edit the fields. Click Save to save changes.

  • To delete an entry, click the delete ST-701-delete-button.jpg icon in the Options column.




Enter an individual IP address or network range to bypass DKIM checks


Select the netmask for the specified IP address. Individual IPv4 addresses will have a /32 ( netmask.

Address Type:

IPv4 (default) or IPv6.


Optional comment for this entry.