kumomta/docs/reference/kumo/make_egress_path/system_shutdown_timeout.md

system_shutdown_timeout

{{since('2025.05.06-b29689af')}}

How long to wait for an in-flight delivery attempt to gracefully complete when the system is being shutdown. Once this timeout is reached, any open sessions will be aborted.

The default value is computed by summing up the per-message-delivery timeout values:

• mail_from_timeout +
• rcpt_to_timeout +
• data_timeout +
• data_dot_timeout

!!! caution If you make this value too short you increase the risk duplicate delivery when the sessions are terminated.