ZCS Multi-Server Installation Guide
ZCS Multi-Server Installation Guide
Open Source Edition 8.0.6

Multiple-Server Installation > Note about MTA servers

Note about MTA servers
New installs of ZCS limit spam/ham training to the first MTA installed. If you uninstall or move this MTA, you will need to enable spam/ham training on another MTA, as one host should have this enabled to run zmtrainsa --cleanup. To do this, set zmlocalconfig -e zmtrainsa_cleanup_host=TRUE.
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