How do I exempt my Zimbra Cluster members from the MagicSpam Rate Limiter?
All members of your Zimbra Cluster should be exempted from rate limiting in MagicSpam, otherwise you may experience mail delivery delays and/or rejections.
To do so, login to your MagicSpam Administration Interface, click the "Settings" tab and then "Exemptions". Then, enter in the IP address for each Zimbra cluster member to the "Per-IP Rate Limiter Whitelist" list.
Your cluster members will now be exempted from MagicSpam's rate limiter.