RecoveryTools Zimbra to Gmail Migration Resource is a really simple to use and simple method. You may recognize its working just by subsequent these simple techniques: for i in `cat emails.txt`; do zmprov ma $i zimbraSignatureName "`cat signatures/$i.name`"; zmprov ma $i zimbraPrefMailSignatureHTML "`cat signatures/$i.signature`"; zmprov ga $i zimbraSignatureId > /tmp/firmaid; https://www.hostscheap.com/zimbra-migration-service