Why is DKIM authentication failing?
Some DKIM validation failures have obvious causes, such as the message not being signed, or the signing domain’s public key not being found in DNS or not being syntactically correct, or perhaps the message was obviously altered in transit.
Can you have multiple DKIM records?
Can I have multiple DKIM records? A domain can have as many DKIM records for public keys as servers that send mail. Just make sure that they use different selector names. If you have any questions about DKIM records or deploying DMARC, don’t hesitate to contact us.
How many DKIM records can a domain have?
It’s possible to have more than one DKIM key published in your DNS records. So, the DKIM selector is important for ensuring that your emails can be properly authenticated. The field specifies which DKIM key you’re using, and the field is filled with your domain name.
How can I check if my DKIM is valid?
As an example, if your DKIM is valid, then it would be in DNS at 20130425164621.pm._domainkey.postmarkapp.com, you can check to see if it is there using this command: The dig command will return the DKIM record value seen in the authentication page. If it does not, it means the record is not in the correct location.
What is the root cause of a DKIM error?
On the sender side, there are two areas of focus to determine the root cause of a DKIM error: the DKIM selector record within DNS and the DKIM signing server. DKIM verification errors may also be caused by the mailbox provider during the verification process.
How does DomainKeys Identified Mail ( DKIM ) authentication verification work?
The success of DomainKeys Identified Mail (DKIM) authentication verification depends on both the sender and the mailbox provider working together to properly configure and implement DKIM signing and verification.
Do you need both public and private keys for DKIM?
In order for DKIM to work correctly, both of these keys must be present. In some cases, simply regenerating the public and private key pair can resolve the issue and save time troubleshooting. If the tip above doesn’t work, here are some detailed steps to troubleshoot DKIM: