--- title: "Resolving the Issue of Google Calendar Invites Failing DMARC Checks | DuoCircle" description: "Resolving the Issue of Google Calendar Invites Failing DMARC Checks." image: "https://www.duocircle.com/images/og-default.png" canonical: "https://www.duocircle.com/blog/email-security/resolving-issue-of-google-calendar-invites-failing-dmarc-checks/" --- Quick Answer Google Calendar invites can fail DMARC because replies route back through Google's servers, breaking SPF alignment with the From domain. Google also sends invites from shared IP ranges that may carry mixed reputation. Fix it by enabling DKIM signing in Google Workspace: copy the DKIM record from Admin Console, Apps, Google Workspace, Gmail, Authenticate Email; publish it as a TXT record at google.\_domainkey.yourdomain; then turn on authentication. Once DKIM aligns with the From domain, Calendar invites pass DMARC even when SPF does not. Resolving the Issue of Google Calendar Invites Failing DMARC Checks Your browser does not support the audio element. [ Download episode](https://media.mailhop.org/duocircle/images/2024/04/Resolving-the-Issue-of-Google-Calendar-Invites-Failing-DMARC-Checks.mp3) Share [ ](https://www.linkedin.com/sharing/share-offsite/?url=undefined%2Fblog%2Femail-security%2Fresolving-issue-of-google-calendar-invites-failing-dmarc-checks%2F "Share on LinkedIn") [ ](https://twitter.com/intent/tweet?text=Resolving%20the%20Issue%20of%20Google%20Calendar%20Invites%20Failing%20DMARC%20Checks&url=undefined%2Fblog%2Femail-security%2Fresolving-issue-of-google-calendar-invites-failing-dmarc-checks%2F "Share on X/Twitter") [ ](https://www.facebook.com/sharer/sharer.php?u=undefined%2Fblog%2Femail-security%2Fresolving-issue-of-google-calendar-invites-failing-dmarc-checks%2F "Share on Facebook") [ ](https://reddit.com/submit?url=undefined%2Fblog%2Femail-security%2Fresolving-issue-of-google-calendar-invites-failing-dmarc-checks%2F&title=Resolving%20the%20Issue%20of%20Google%20Calendar%20Invites%20Failing%20DMARC%20Checks "Share on Reddit") [ ](mailto:?subject=Resolving%20the%20Issue%20of%20Google%20Calendar%20Invites%20Failing%20DMARC%20Checks&body=Check out this article: undefined%2Fblog%2Femail-security%2Fresolving-issue-of-google-calendar-invites-failing-dmarc-checks%2F "Share via Email") ![Failing DMARC Checks](https://media.mailhop.org/duocircle/images/2024/04/dmarc-generator-3849.jpg) Sometimes, [Google Calendar invites](https://simplyscheduleappointments.com/guides/google-invites/) don’t pass DMARC authentication checks because when the recipient replies to the invitation, the response is sent back through **Google’s servers**. _Since the ‘From’ address and the originating servers don’t align, the Google Calendar invitation gets rejected as the sending domain’s [DMARC policy](/resources/dmarc-policy) instructs so_. Another reason is that Google uses [shared IP addresses](https://influencermarketinghub.com/glossary/shared-ip/) to send invites, and if any of these IPs have a **history of spam** or abuse, DMARC authentication will show negative results. _This can be resolved by adding **Google’s DKIM record** to your DNS, followed by turning on DKIM authentication on [Google Workspace](/email-security/simplifying-google-workspace-email-security)._ ## Resolving the Issue Google has been supportive of [DMARC](/email/dmarc), and hence, resolving this issue **isn’t a big deal**. You need to proceed like this- ### Step 1: Add Google’s DKIM Record to Your Domain’s DNS - Go to the [Google Workspace admin console](https://admin.google.com/). - Click on ‘**Settings for Gmail**,’ followed by navigating to ‘Authenticate Email.’ - Copy the DKIM record Google will use to digitally sign your emails for authentication. - Add the copied DKIM record as a **TXT record** to _google.\_domainkey_. ### Step 2: Turn on DKIM Authentication - Go to the [Google Workspace admin console](https://admin.google.com/). - Click on ‘Settings for Gmail,’ followed by navigating to ‘Authenticate Email.’ - Click on ‘**Start Authentication**.’ [![ DKIM Authentication](https://media.mailhop.org/duocircle/images/2024/04/buy-smtp-1.jpg)](https://media.mailhop.org/duocircle/images/2024/04/buy-smtp-1.jpg) ## Best Practices for DKIM Keys [DKIM](/resources/what-is-dkim) keys are cryptographically secured pairs of keys that provide a mechanism for email recipients to verify that an email is actually send by who it is claiming to come from and that **no one has tampered** with its content in transit. Now that you know how to solve the Google Calendar invite problem, follow the **best practices** shared below to avoid DKIM-based email authentication issues. ### Key Length Shorter keys are easier to break and decipher; hence, **don’t use keys shorter than 2048-bit**. Earlier, even 1024-bit was considered strong, but the technical progression, both malicious and ethical, has demanded a more complex key structure. ### Periodic Rotation Although the ideal [DKIM key rotation](/email-security/best-practices-to-follow-when-implementing-spf-dkim-and-dmarc/) frequency depends on your company’s operational needs, availability of technical resources, and risk exposure, it’s advised that you **rotate it at least twice a year** or every six months. Quarterly rotations are more suitable for better [cyber threat prevention](/phishing-protection/how-to-be-cyber-smart-the-best-cybersecurity-tips-to-empower-your-team-this-cybersecurity-awareness-month/). [![cyber threat prevention](https://media.mailhop.org/duocircle/images/2024/04/sender-policy-framework-2584.jpg)](https://media.mailhop.org/duocircle/images/2024/04/sender-policy-framework-2584.jpg) ### Expiration Expiration dates are important as they disallow [threat actors](https://thehackernews.com/2024/04/researchers-identify-multiple-china.html) to continue exploiting DKIM keys if they get compromised. When generating DKIM keys, administrators specify an expiration date. _Keeping track of these expiration dates is important to **ensure timely key rotation**_. ### Test Mode _Testing mode helps determine whether the DKIM key is working efficiently against [cyber exploitations](https://punchng.com/cybercriminals-exploit-remote-desktop-protocols-in-cyber-attacks-report/)_. You can indicate the test mode by **specifying ‘t=y’** and changing the value to ‘t=s’ before deploying the protocol so that the mail provider doesn’t disregard the **DKIM signature**. ### Monitoring Organizations can implement **alerting systems** that notify administrators or security teams when [DKIM authentication](/email-hosting/what-is-dkim-and-why-you-should-use-it-to-secure-your-email/) failures are detected. These alerts can prompt immediate investigation and remediation to address any issues with DKIM-signed emails. Another effective way to monitor DKIM is through **log analysis**, which helps identify patterns of DKIM failures, detect [potential security threats](https://blog.detectify.com/industry-insights/misconfigured-email-servers/), and troubleshoot delivery issues emerging from DKIM misconfigurations. Lastly, [DMARC reporting](/content/dmarc-report) also **helps monitor issues** in your DKIM configurations. Contact [DuoCircle](/) for any inquiries regarding this topic. ## Topics DMARCemail securityUpdates ![Brad Slavin](https://media.mailhop.org/dmarcreport/images/team/brad-slavin.jpg) Brad Slavin General Manager General Manager at DuoCircle. Product strategy and commercial lead across the email security portfolio. ## Secure your email infrastructure Protect, authenticate, and deliver. Contact our team to find the right solution. [Contact Sales](/contact/) [Explore Products](/products/) ## Related Articles [ Email Security 8m Best Practices to Follow When Implementing SPF, DKIM, and DMARC Mar 19, 2024 ](/blog/email-security/best-practices-to-follow-when-implementing-spf-dkim-and-dmarc/)[ Email Security 3m Best Ways to Secure Emails in 2024 Apr 26, 2024 ](/blog/email-security/best-ways-to-secure-emails-in-2024/)[ Email Security 6m Comparison Between SPF, DKIM, and DMARC Nov 16, 2023 ](/blog/email-security/comparison-between-spf-dkim-and-dmarc/)[ Email Security 8m Configuring DKIM to sign mail from your Microsoft 365 domain Jun 27, 2024 ](/blog/email-security/configuring-dkim-sign-mail-from-your-microsoft-365-domain/) ```json {"@context":"https://schema.org","@type":"Organization","name":"DuoCircle LLC","url":"https://www.duocircle.com","logo":{"@type":"ImageObject","url":"https://www.duocircle.com/images/duocircle-logo.png"},"description":"DuoCircle is a portfolio of specialized email products covering protection, authentication, delivery, and routing. 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