# cat /etc/pki/postfix/certs/rapidssl_2015-10-15_mx01.nausch.org.certificate.pem \
       /etc/pki/postfix/certs/RapidSSL_SHA256_CA_-_G4.pem \
       /etc/pki/postfix/certs/GeoTrust_Primary_Certification_Authority_-_G3.pem > \
       /etc/pki/postfix/rapidssl_2015-10-15_mx01.nausch.org.full_certificate_chain.pem