Complete procedures with a way back.

Diagnose Apache 403 Forbidden and 500 Internal Server Error from correlated virtual-host, error and application logs. Then, when a planned logging change is needed, configure useful request fields, protected destinations and safe rotation.

Measure queue age and volume, inspect headers and bodies, trace routing and logs, retry individual messages, isolate frozen mail, and remove only proven unwanted entries.

Log request timing and upstream timing per site, protect log paths, validate rotation, and prepare bounded incident queries for 4xx, 5xx, and slow requests.