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This error appears when sending a signed email without a valid internet certificate linked to your Lotus Notes ID. To fix this, go to File > Security > User Security, then check Your Identity > Your Certificates. If no certificate is available, request one from your administrator or a trusted Certificate Authority (CA) and import it into Lotus Notes.

If this error affects email access, you can migrate emails from NSF to Outlook using eSoftTools NSF to PST Converter. It preserves signed emails and maintains email integrity during migration.

More Detail - Your current ID does not specify an Internet certificate for signing