I have been googeling for days! I have a cert from rapidssl. I read up that the problem with num=20, is that indicates it doesn't know the issuer, or doesn't know the ROOT Cert, right?

I run this command: openssl s_client -showcerts -connect smtp.server.com:465

I get this error:

verify error:num=19:self signed certificate in certificate chain

Here is what i have in my postfix main.cf, and what i have done:

smtpd_tls_key_file = /etc/postfix/ssl/smtp.server.com.rsa.key (this is the private key)

smtpd_tls_cert_file = /etc/postfix/ssl/smtp.server.com.PUBLIC.key (this is the public key given to me by rapidssl)

smtpd_tls_CAfile = /etc/postfix/ssl/combo.csr.key This key has both the intermediate keys ON TOP, and the ROOT KEY on the bottom.

Here is the Intermediate keys:

https://knowledge.geotrust.com/library/VERISIGN/ALL_OTHER/geotrust%20ca/GT_QuickSSL_and_Premium_and_Trial_intermediate_bundle.pem

and here is the root CERT:

http://www.geotrust.com/resources/root_certificates/certificates/Equifax_Secure_Certificate_Authority.cer

anyone know how to use rapidssl certs?