How to Fix Invalid Certificate Outlook Cannot Sign or Encrypt Problem?

Invalid Certificate Microsoft Outlook Cannot Sign or Encrypt error occurs when your system displays the message like “the name on the security certificate is invalid or does not match the name of the site. In this blog, Outlook Customer Support Service team will guide you to Fix Invalid Certificate Outlook issue.

Fix Invalid Certificate Outlook

Methods to Fix Invalid Certificate Outlook Cannot Sign or Encrypt Problem

To fix the Invalid Certificate Outlook Cannot Sign or Encrypt issue, you need to activate the certificate which you are using in outlook.

Method 1: For Outlook 2013

  • Go to the tools and select the option and click on security
  • Now tick on the Add digital signature to outgoing messages
  • After that tick on the Send clear text signed message when sending signed messages
  • After following this, you have to un-tick the Encrypt contents and attachments for outgoing messages

Method 2: For Outlook 2017

  • First, go to the tools and select the Trustcenter and click on Email Security
  • Then, click on the Add digital signature to outgoing messages
  • After that, tick on the Send clear text signed message when sending signed messages
  • After following this, you have to un-tick the Encrypt contents and attachments for outgoing messages

Method 3: Fix Invalid Certificate Outlook

  • Go to the tools menu and click on option and click on the security option
  • Now click on settings and then click on security labels
  • Then, in the policy module list, click on the “None”.

Note: If system security does not allow you to choose the “none” option then, you have to contact with your system administrator to get the correct certificates for your account.

Method 4: Replace the Existing A Record by Using New Create SRV Record

Create SRV Record

  1. Make sure that you are creating SRV Record in the DNS zone that matches the user’s SMTP Domain. Here are the SRV Record properties:
  2. Service: _autodiscover
  3. Protocol: _tcp
  4. Port: 443
  5. Host: URL for Redirection
  6. After creating New SRV Record, you have to test it by changing user host file to redirect the current A record to an invalid IP.
  7. Now remove the existing A record form the DNS.

Related Blog: How to Fix Corrupt Outlook Profile?

After following these easy steps, we hope that you are able to Fix Invalid Certificate Outlook Error.

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