This certificate was signed by an unknown authority.This certificate was signed by an untrusted issuer.Find the expired or revoked certificates and delete themĮxpired, invalid or revoked certificates usually have a red X sign, and they’re accompanied by one of the following alerts:.Open the LaunchPad and launch Keychain Access.Here’s how to remove problematic certificates:
If the SSL certificates are no longer valid or got deleted, the Mail app won’t be able to verify it.
Hit the Turn off Firewall button to disable the firewallįix 2 – Remove expired or revoked SSL certificates.Unlock the panel to make the necessary changes.Click on the Apple menu > go to System Preferences.You can re-enable it after you added your Google account to the Mail app. Your antivirus or firewall might be blocking certain Mail processes on your Mac preventing it from validating the server certificate.Īs a workaround, try turning off your antivirus and firewall.
Fix Mac Mail failed to verify the server certificate Fix 1 – Disable your antivirus and firewall If your Mac’s Mail app could not verify the server certificate, this could indicate you’re not using the correct network or proxy settings, the SSL certificates expired or got revoked or you firewall is preventing you from using your email. This could be because of your network configuration or your proxy settings. Many users reported they were unable to add or use a Gmail account on their Mac computers because the Mail app failed to verify the server certificate.Īnd this is the exact error message they received:įailed to verify the server certificate.
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