DKIM is an email authentication method that is used to verify if the mail sent from a certain domain is forged or not. Receivers may verify that outgoing messages are from the sender they claim to be from and that the message's content has not been tampered with when they are signed using DKIM. You must first establish a DKIM signature in order to activate DKIM authentication.
Enabling DKIM Signing to your account in AuthSMTP
The DKIM in AuthSMTP is enabled on a per-domain basis. To enable DKIM for your domain, follow the steps :
Login to your AuthSMTP Control Panel.
Go to Advanced Config > DKIM signing.
Generate the DKIM record and copy it to the clipboard.
After the DKIM record is generated, you will have to publish the record through the public-facing side of your DNS.
Publishing DKIM Records 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.exampledomain.com
In the section allotted for the TXT record value, paste the copied contents of the DKIM public key generated in the Control Panel.
Lookup and validate the published DKIM DNS record using this free DKIM record lookup tool
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