The goal is to allow signing domains to assert responsibility for the email messages they send and thus allow message recipients to know that the message came from a trusted source. DKIM does exactly that by using a cryptographic signature to encrypt email messages. It is a must-have addition to your email security suite for obvious reasons.
If your DNS is handled by Pobox, the DKIM is already enabled and no steps need to be taken. Otherwise, you will have to publish the DKIM key through your DNS which will be provided by Pobox. You can access the DKIM public key for your domain by navigating to the MyPobox Page in the Pobox. Copy the DKIM key to your clipboard.
After this, you will have to publish the DKIM key through your DNS for which you can follow the steps below:
Publishing the DKIM record in DNS:
Log in to your DNS management console
Create a TXT record in your DNS with the title : <selector>._domainkey.<yourdomainname.com> for example: s1._domainkey.yourdomainname.com
In the section allotted for the TXT record value, paste the copied contents of the DKIM public key.
Lookup and validate the published DKIM DNS record using this free DKIM record lookup tool
Enable DMARC for your domains to protect against spoofing. Sign up for a DMARC trial today!