Why does Klaviyo DKIM sign the List-Unsubscribe header, and what are the implications?
Summary
What email marketers say7Marketer opinions
Email marketer from GlockApps explains that DKIM signing the List-Unsubscribe header helps improve inbox placement by demonstrating to mailbox providers that the sender is committed to providing a safe and trustworthy email experience. This can lead to higher engagement rates and better overall email performance.
Email marketer from Litmus explains that DKIM authentication, including signing of the List-Unsubscribe header, improves email deliverability rates by confirming the sender's identity and assuring mailbox providers that the email is legitimate. This reduces the likelihood of emails landing in the spam folder.
Email marketer from Mailjet discusses how including the List-Unsubscribe header in DKIM signatures protects subscribers from potential abuse and ensures a secure and reliable unsubscribe process. This helps maintain trust with recipients and complies with anti-spam regulations.
Email marketer from Reddit shares that signing the List-Unsubscribe header with DKIM is considered a best practice as it assures recipients and mailbox providers that the unsubscribe option is legitimate and hasn't been tampered with, improving sender reputation.
Email marketer from Stack Overflow explains that DKIM signing the List-Unsubscribe header ensures its integrity. Without it, an attacker could modify the header to redirect unsubscribe requests to a different address, potentially harming the sender's reputation.
Email marketer from Email on Acid explains that by DKIM signing the List-Unsubscribe header, senders can build trust with email providers and subscribers. This authentication method verifies the sender's identity and ensures the integrity of the unsubscribe process, reducing the risk of spam complaints.
Marketer from Email Geeks clarifies that DKIM signing the List-Unsubscribe header is required per RFC8058 if you implement RFC8058 list-unsubscribe.
What the experts say3Expert opinions
Expert from Spam Resource explains that the recent webinar covers everything about list-unsub, including RFCs and DKIM header requirements. This addresses the 'why' behind DKIM signing the List-Unsubscribe header – it's often a requirement from specifications and best practices.
Expert from Email Geeks shares that without DKIM signing the List-Unsub header, someone could modify the header to trick people into sending a sign of life via DKIM replay.
Expert from Email Geeks explains that the List-Unsub header is required to be DKIM signed as part of the new Yahoogle requirements. It's also good practice for deliverability, whether required or not.
What the documentation says3Technical articles
Documentation from Google explains that robust authentication, including DKIM, is crucial for ensuring deliverability to Gmail users. Signing all relevant headers, including List-Unsubscribe, enhances trust and reduces the risk of emails being marked as spam.
Documentation from RFC Editor specifies that if the List-Unsubscribe header is implemented according to RFC 8058, it SHOULD be signed using DKIM to prevent modification or spoofing by malicious actors.
Documentation from Microsoft highlights that using DKIM to sign critical headers like List-Unsubscribe can prevent phishing and spoofing attempts. This helps maintain the integrity of email communications and builds trust with recipients, leading to better engagement.