Hi to all.
  Sorry for my bad english.

   I have to do the certificate for ipop3, imap, http
   and I looking for in mailinglist.
   I find some mail but I want to learn the philosopy
   of certificate :

   what is  *.key ,
   what is *.csr ,
   what is *.crt,
   what is *.pem

      and which  is their use and for what

    Alessandro




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