Sending Documents to Customs
Sending attached documents to Finnish Customs
Prerequisites
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Documents must be scanned or attached to the shipment.
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Each document must have a valid Document type.
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Invoices must use document type N380.
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Step 1: Open “Send attachment(s)”
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Open the shipment in Postbox.
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Select the shipment you want to send documents for.
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In the top menu, click Send documents.
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Choose Send attachment(s).


Only documents that are scanned or attached to the shipment and have a document type will be sent.
Step 2: Check and edit attachment details
The Attachment setup window will open.
For each attached document:
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Select the document from the list.
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Verify or fill in the following fields:
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Title (optional)
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Document type
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Use N380 for invoices.
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Description (optional)
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Language (if required)
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Click Save after making changes.

⚠️ Documents without a valid document type will not be sent.
Step 3: Ensure documents are added to “Additional documents”
Only documents added under 44. Additional documents can be selected and sent.
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Open 44. Additional documents on the shipment.
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Make sure the relevant documents are listed there.
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Typical examples:
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N380 – Invoice
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N740 – Other supporting documents
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If multiple documents are added in field 44, you will be able to choose between them when sending.
Step 4: Send the documents
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Once all required documents are correctly set up, click Save.
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The documents will now be sent to Customs automatically.
Tips
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Always double-check that invoices use document type N380.
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Use clear titles and descriptions to make document handling easier for Customs.
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If a document is rejected, review the document type and required fields before resending.