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Last updated March 2020

SMTP AUTH user rate limiting. This check is never evaluated if the sender is not authenticated with SMTP authentication.

Find below the sample excerpt included in the dp_config.lua file.

msys.dp_config.audit_series.auth_user = {
  type = "string",
  interval = 900,
  buckets = 4,
  thresholds = {
    { check = true,
      startv = 0,
      endv = 3,
      threshold = 100,
      honor_whitelist = { "global" }
  options = {
    persist = true

The elements of this configuration table are as follows:


The only legal value for this element is string.


The time interval that you wish to look at measured in seconds. A reasonable value might be 900.


A bucket is a window of time of the length defined by "interval". A reasonable value might be 4.


thresholds is a nested table within this configuration option. The following list defines the attributes of the individual thresholds.


Whether or not to use this configuration item.


The starting bucket (0 is the current bucket) to query across.


The ending bucket.


When this count is exceeded, rejection happens. When this threshold is exceeded code 451 is issued along with the message Authenticated user rate limit exceeded.


A table listing any applicable whitelists set in the msys.dp_config.whitelist table.


This item is a table with the following possible keys:


Write audit series to log. The value may be true or false; false is the default.

When true, the log will be written to the directory defined by the serialize_dir option in the inbound_audit module. The default value for this option is /var/log/ecelerity/audit_series_persist.


Defaults to none, but can be cluster to send to all nodes, or manager to send only to cluster manager nodes. This requires explicit configuration in the cluster stanza to operate correctly. For more information see Data Replication.


When set to true, the audit series will be persisted. The persisted series will be reloaded when the engine restarts. The default value is false.

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