I am running v4.5.6 and just realized that all my cronjobs fail:

su - zimbra -c "/opt/zimbra/libexec/zmpurgemessages"

Received SOAP fault: authentication failed for zimbra

Its the same if I run it as user "zimbra" or if I use su as listed above. It's the same for all cronjobs. How can I reset the password?

Not sure if it is update related or if I broke it earlier ...