To convert .cer to .p7b (PKCS #7) in open ssl, use the following code.
openssl pkcs12 -in certificate.cer -certfile cert-bobo.cer -certfile cert-holddor.cer -inkey certificate.key -export -out certificate.pfx
You can also learn how to convert other certificates.
Convert .Crt Certificates
Convert .Cer Certificates
Convert .jks Certificates
Convert .pem Certificates
Convert .der Certificates
Convert .p7b Certificates
Convert .p12 Certificates
See Also:
How to Setup Email on DigitalOcean
How to Add Sudo User in Ubuntu and Linux with Root Privileges
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