Create self certificate on Centos 5.3 (Mail Server)

Reference Website: isp mailserver with virtual users domains postfix dovecot mysql centos5.0

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mkdir -p /etc/postfix/ssl/certificate

cd /etc/postfix/ssl/certificate

openssl genrsa -des3 -rand /etc/hosts -out smtpd.key 1024

chmod 600 smtpd.key

openssl req -new -key smtpd.key -out smtpd.csr

openssl x509 -req -days 365 -in smtpd.csr -signkey smtpd.key -out smtpd.crt

openssl rsa -in smtpd.key -out smtpd.key.unencrypted

mv -f smtpd.key.unencrypted smtpd.key

openssl req -new -x509 -extensions v3_ca -keyout cakey.pem -out cacert.pem -days 365

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Check certificate

openssl x509 -in cacert.pem -text -noout

How to read CSR File with linux command

CSR generation in MMC (Microsoft Management Console)

https://www.namecheap.com/support/knowledgebase/article.aspx/9854/2290/how-to-generate-a-csr-code-on-a-windowsbased-server-without-iis-manager/

Verify CSR command 

$openssl req -in name.csr -noout -text

Verify certificate commands and key

$openssl rsa -noout -modulus -in server.key | openssl md5;

Ref 

https://watto-nms.coc-ibm.com/manual/Generate-a-Self-Signed-Certificate-or-a-Certificate-Signing-Request.html