Client and Message Rate Controls
Apply inbound controls without blocking legitimate shared networks.
Production note: Back up configuration, run
postfix check, and stage changes before reloading.Available controls
smtpd_client_connection_rate_limit = 50
smtpd_client_message_rate_limit = 100
smtpd_client_recipient_rate_limit = 500Scope
These limits are per anvil time unit and can affect NATed or shared clients. Authenticated submission may need separate service overrides.
Exceptions
Use smtpd_client_event_limit_exceptions carefully for trusted networks.
Verify
Observe rejection logs and legitimate traffic patterns before lowering thresholds.