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All XCC and MTA values are pre-adjusted to match the expected sizing, based on the average number of emails received per day as reported by the customer. The reputationComplexityFactor and smtpd_client_connection_count_limit are set to the default values and and should only be changed when performance tuning is needed. If the default values do not match your sizing profile, update them accordingly, and restart the corresponding component as described in Operation Guide.

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XCC

  • XCC_START_PARAMS (/etc/xorlab/xcc/backend/backend.env) XCC_START_PARAMS=-com.twitter.finagle.netty4.numWorkers=N, where N equals:
  • XCC_JVM_ARGS (/etc/xorlab/xcc/backend/backend.env)
  • ES_JAVA_OPTS (/etc/xorlab/elastic/docker-compose.yml)
    Values in the table are not ranges! Each is a single value in the form of -Xms6g -Xmx6g which sets both the initial and maximum heap size allocated to the Java Virtual Machine
  • REDIS_MAXMEMORY (/etc/xorlab/xcc/.env)

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MTA

  • CORE_JVM_ARGS (/etc/xorlab/activeguard/.env)

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Expert Editor

  • reputationComplexityFactor (xcc.yml) This factor roughly controls the granularity of the reputation complexity. The value of 50 is recommended for setups with less than 100 mailboxes.
    • Minimal value: 0
    • Maximal value: 100
    • Default value: 100
  • smtpd_client_connection_count_limit (main.cfg.vmx.N) Controls how many simultaneous connections any client is allowed to make to the Postfix service; useful only when handling very high volumes of mail traffic (Extra Large sizing and beyond). See the official Postfix parameter documentation or Postfix performance tuning guide.