- When an email for a certain recipient is permanently rejected by the destination server with a 5xx error code, the destination address of the recipient is considered invalid and all emails sent to the recipient will be rejected.
- CSEG filtering servers caches this information locally for up to two hours. The CDAS interface allows you to clear the call-out cache without waiting for the servers to clear it.
Clear incoming cache
- Click 'Incoming' on the left then select 'Clear incoming cache'.
![](/uploads/Comodo%20Secure%20Email%20Gateway%20MSP/2761554c3a4c849853c509f0595763a5/5eac818f1e1c4adc19d335055b06586b/523a8a76d2b23bf169ffcb7f3ca10a55/cseg13.png)
The 'Clear incoming cache' interface will open:
- Click the 'Clear' button
The callout cache for the incoming domain is cleared.
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Click the
to close the notification.