There are a few different methods for generating your email signing certificate depending on what kind of certificate you have, or what operating system you use. Check out these guides for the instructions that work best for your certificate.
- Comodo Personal Authentication Certificate: Generate and Collect CPAC in Browser
- Comodo Personal Authentication Certificate: Manual CSR Generation Method
- DigiCert S/MIME Certificate: Generate and Collect S/MIME in Browser
- MacOS: Generate CSR for Email Certificates
- Overview of Certificate Signing Requests (CSR) for Email Certificates