Should I upload my key to the Mailvelope key server?. How can I export or back up my keypair?. Do I need a new key if I get a new email address?. How can I change the password for my private key?. 
What is the difference between my private key and a public key?. Why does Mailvelope need to change content on websites I visit?. Can I install Mailvelope on other browsers besides Chrome,Firefox and Edge?. 
WEB.DE and GMX: I need to enter a "recovery code". What are they necessary for and how does Mailvelope handle my data? Google requests additional permissions for the Gmail API integration of Mailvelope. My webmail provider isn't pre-configured (authorized) in Mailvelope. Which webmail providers does Mailvelope support?. Can I also use Mailvelope on mobile devices?. Who develops Mailvelope and how is it supported?. What is Mailvelope and how does it work?. Now the signature is validated and it will display Signature is VALID, signed by message in Signature Properties window which is opened in Step 6.Ĭlick on the Close button to close the Signature Properties window. Select Use this certificate as a trusted root checkbox and click on the OK button to import contact settings into your system. Now it will display the Import Contact Setting window. Here, you will see the This Certificate is not a trusted message.Ĭlick Add to Trusted Identities and when Adobe Reader asks if you are sure you want to add it click OK. Here, select Show Signature Properties in the menu, and the Signature Properties window is shown.Ĭlick on the Show Certificate button, and a Certificate Viewer window will open from where you can see the details of the certificate.įrom the Certificate Viewer window, click on the Trust tab, and you can now see the Trust settings. If At least one signature has problems error is still visible, select the signature which has the problem and right-click on it. If the signatures are successfully validated Adobe Reader will show the message Signed and all signatures are valid. If that is the case, you can skip the next steps. 
Once all signatures are validated it will show a success message depending on the settings. It will prompt the message to validate all signatures depending on the settings.Ĭlick OK to validate all the signatures.
Click on the Signature Panel button, which will be on the right of the error.Ĭlick on the Validate all link. Open the PDF document in Adobe Reader showing the “At least one signature has problems” error. If you cannot follow this guide, we recommend you to make a more specific Google search on how to resolve it on your device. Again, note this issue may be resolved differently on your device. 
Here's a step to step guide on how to resolve the issue.
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