Undelivered outbound faxes from Retarus Cloud Fax services can be automatically sent to the Fax Portal for centralized management and recovery. In the Fax Portal, you can resend, correct, forward, archive, or otherwise process these faxes using the available tools.
If an outbound fax cannot be delivered because of a transmission issue, such as a busy line, no answer, remote error, or carrier or network problem, the system sends the fax to the Fax Portal after all configured retry attempts are exhausted.
The undelivered fax appears in the Fax Portal like any other outbound fax. Its status clearly shows why delivery failed.
📌 The original record in the source service remains unaffected. The Fax Portal receives a copy of the undelivered fax for recovery purposes.
Supported services
This feature applies to faxes sent through any Retarus Cloud Fax outbound service, including:
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Enterprise Fax Portal
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Email-to-Fax
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Fax-for-Applications
Enabling undelivered fax collection
This feature can be enabled or disabled for your account.
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Enabled
Undelivered outbound faxes are automatically sent to the Fax Portal and remain in the originating service. The original record in the source service is unchanged. -
Disabled
Undelivered outbound faxes remain only in the originating service.
Contact your administrator or Retarus Support to configure this setting for your account.
Accessing undelivered faxes
To view undelivered faxes in the Fax Portal:
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In the left sidebar, expand your faxbox and select Outbound.
→ The main area displays all undelivered faxes in a list view.
Resending undelivered faxes
After you locate an undelivered fax in the Outbound folder, you can resend it directly from the list. See Resend a fax for step-by-step instructions.