Advanced Hurricane Usage
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      How to convert a DKIM private key from pfx format to PEM

      You can use the following free openssl tool to convert a DKIM private
      key from pfx format to PEM:
      http://www.slproweb.com/products/Win32OpenSSL.html
      [http://www.slproweb.com/products/Win32OpenSSL.html]

      Once you have installed the program and opened it, simply issue the
      command below.

      openssl pkcs12 -in c:certsyourcert.pfx -out c:certsyourcert.pem
      -nodes

      Next, open the PEM file in a text editor (such as NotePad or
      EditPlus) and ignore all but the last certificate section.

      -----BEGIN CERTIFICATE-----

      and ends

      -----END CERTIFICATE-----

      You can then copy and paste everything from the begin tag to the end
      tag (including the tags themselves) into the private key text box.