Hi there, I have the same problem:
I have tried your solution and more other, I was found here in forum (using GeoTrust and etc...) but I still have this problem. Please, can somebody help me with this? I trying to solve this per two weeks, but I still cant (
mail:/opt/zimbra/ssl/zimbra/commercial# /opt/zimbra/bin/zmcertmgr verifycrt comm /opt/zimbra/ssl/zimbra/commercial/commercial.key commercial.crt commercial_ca.crt
** Verifying commercial.crt against /opt/zimbra/ssl/zimbra/commercial/commercial.key
Certificate (commercial.crt) and private key (/opt/zimbra/ssl/zimbra/commercial/commercial.key) match.
XXXXX ERROR: Invalid Certificate: commercial.crt: /serialNumber=8MvKL0Kn-0MUq7vAKp/Yb8eO49ETC=CZ/O=mail.DOMAIN/OU=GT98696796/OU=See www.rapidssl.com/resources/cps (c)11/OU=Domain Control Validated - RapidSSL(R)/CN=mail.DOMAIN
error 20 at 0 depth lookup:unable to get local issuer certificate
Thank you so much