By appending a digital signature that has been validated against a public DNS record, DKIM (DomainKeys Identified Mail) offers a strong defense against spoofing. This ensures the integrity and validity of digital communications. Still, problems occur when certain headers are absent, such 'garbage'. In order to maintain the balance between security and usability, the protocol's flexibility in addressing certain cases makes sure that missing headers do not always result in verification failures.

Resolving DKIM verification issues during Google's Gmail API message delivery emphasizes how difficult it is to guarantee digital security in contemporary communication.

For enterprises looking to improve email security and integrity, securing the DKIM implementation in .NET Core for Office 365 email servers is absolutely essential.

Adding more than one DKIM and SPF record to a single domain, especially in conjunction with Microsoft Exchange, offers a strong foundation for improving the security and integrity of domain-based messaging.