Since today, a (relatively old) Zimbra installation of a specific customer is detected by Google Safe Browsing as a phishing/deceptive site, with the classical red screen and all.
We suspect an email account was compromised and sent some small amount of spam, but is this sufficient to explain the site listing in Safe Browsing? Unfortunately, I can not find many informations on Google's site tools regarding the ban's root cause.
Any advise on how to unban it?
EDIT: I already checked for RBLs, and none lists the IP address of this Zimbra installation.