![]() For example, the sender's certificate may have expired, it may have been revoked by the certificate authority (CA), or the server that verifies the certificate might be unavailable. If a digital signature isn't valid, there can be many causes. Clear the browser cache The simplest and probably the most obvious reason why the invalid certificate error appears on a website is because the site has made changes to its domains How to fix Invalid Certificate Microsoft Outlook cannot If you receive this message, launch Keychain Access and ensure that both the Microsoft_Intermediate_Certificates and Microsoft_Entity_Certificates are present under Keychains If you see the message often, here're some ways to get your Mac to trust a certificate and fix the problem. For your issue, please go to File->Options->Trust center->Trust Center Settings->Email Security, and ensure that the Encrypt contents and attachments for outgoing messages and Add digital signatures to outgoing messages is unchecked macOS In Outlook 2016 for Mac, a signed email message reports, The signing certificate for this message is not valid or trusted. Home The signing certificate for this message is not valid or trusted Mac OutlookĪnswer.
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