Configuring Whitelist/Blacklist on ZIMBRA 8.5/8.6
ZIMBRA 8.5 and later changed the configuration for blacklists and whitelists. To add whitelist/blacklist entries, follow these steps. Whitelist: create /opt/zimbra…
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RBLs.
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White list for ZIMBRA to bypass RBLs
If you use RBLs such as spamhaus.org on ZIMBRA to block spam, a customer's mail server may be blacklisted by the RBLs and unable to send to your system after being identified as potential spam.