delay_dsn_max_retry_interval — maximum interval for sending DSNs to the sender of a message that has not yet been delivered
Delay_DSN_Max_Retry_Interval = "43200"
The maximum interval between successive warning messages (delivery status notifications, or DSNs) sent to the sender of a message that has not yet been delivered. This provides a cap on the effective interval between DSNs calculated from
To use this feature the delay_dsn module must be loaded.
The default value for this option is
delay_dsn_max_retry_interval is valid in the binding_group, binding, domain and global scopes.