How to Convert SSL Certificate File from CRT TO DER TO PEM Format?

How to Convert SSL Certificate File from CRT TO DER TO PEM Format :-

There are following steps :-

1. Open a putty session to the Secure VM

2. Copy the obtained CRT file from the CSR to the working directory

3. Run the following command to first convert the CRT file to a DER file:
openssl x509 -in example.crt -out openssl.der -outform DER
             (Substitute example.crt as your current CRT filename)

4. Then run the following command to convert the openssl.der file which we just created, to a PEM file
openssl x509 -in openssl.der -inform DER -out openssl.pem -outform PEM

5. There you go.  Now you have a openssl.pem file which works for Netmail Secure.