What action should you take if valid emails are marked as spam by others?

When valid emails are marked as spam by others, checking SPF (Sender Policy Framework), DKIM (DomainKeys Identified Mail), and DMARC (Domain-based Message Authentication, Reporting & Conformance) records is a crucial action to take. These records are essential for email authentication, which helps prevent email spoofing and ensures that emails are delivered successfully to the recipient's inbox instead of being categorized as spam.

SPF helps verify that the server sending the email is authorized to do so by the domain owner. DKIM adds a digital signature to the header of your email, allowing the receiving server to check if the email was altered in transit and confirm it truly comes from the sender's domain. DMARC builds on SPF and DKIM by providing instructions on how to handle emails that fail authentication checks.

By ensuring that these authentication mechanisms are correctly configured, you significantly reduce the likelihood of legitimate emails being marked as spam. This proactive approach addresses the underlying issue of email deliverability rather than relying solely on reporting the problem or changing the sending domain, which may not resolve the authentication issues present.