550 dkim encountered the following problem validating
The reason that these are tough to troubleshoot is because there’s no real way for either side to reproduce the conditions under which the message was signed and validated.
First, we’ll look at the ones that are mostly of passing interested to the reader: The reason these parts are of interest to the receiving server is that they provide the information necessary to help the receiver validate the signatures.Similarly, the signer likely has no access to the validator’s infrastructure and so has no way to try to validate the message in the way that the validator did.Failures like I’m describing here are rare occurrences, and DKIM validation failures by themselves usually don’t have an impact on delivery placement.One of the keys is kept private and available to the sending server for the signing of mail, and the other is to be made public in DNS for use by receiving domains in attempts to validate the signature.The methods for generating these keys and installing them are platform-dependent and beyond the scope of this post, although later I will describe the publishing in DNS of the public DKIM key.
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My goals for you with this post are that you learn and understand the following concepts about DKIM: DKIM is referred to as “content-based” authentication, rather than “path-based”, because whether or not a message passes DKIM validation is based solely on whether or not the content has changed between the time it was signed and the time validation was attempted.