Contents
What can cause DKIM to fail?
When can DKIM fail the check?
- DKIM signature domain and sender (Header From) domain do not align;
- DKIM public key record, published in DNS, is incorrect or is not published at all;
- Sender’s domain DNS zone is unreachable for lookup.
- The length of the DKIM key, used for signing, is too short.
What causes SPF to fail?
SPF authentication failures can happen due to the following reasons: The receiving MTA fails to find an SPF record published in your DNS. You have multiple SPF records published in your DNS for the same domain. Your ESPs have changed or added to their IP addresses which have not been updated on your SPF record.
What does SPF not aligned mean?
SPF Alignment is the alignment of two (2) headers found in an email message, meaning the value found in those two headers(a domain) needs to align with one another. This alignment basically means that the value found in each header, which is a domain, must match with the domain found in the other header.
What is a DMARC policy?
A DMARC policy allows a sender’s domain to indicate that their emails are protected by SPF and/or DKIM, and tells a receiver what to do if neither of those authentication methods passes – such as to reject the message or quarantine it.
What does DKIM do?
DKIM ( Domain Keys Identified Mail) is an email authentication technique that allows the receiver to check that an email was indeed send and authorized by the owner of that domain. This is done by giving the email a digital signature.
What is a DMARC record?
Understanding DMARC. A DMARC record – which stands for Domain-based Message Authentication, Reporting, and Conformances – is a technical email authentication standard benefitting email senders by helping establish the legitimacy of emails by validating that an email is actually coming from the specified source.