I'm not sure about earth class mail, but Swiss Post Box will deliver them. Using the default settings, if I'm not mistaken, only envelopes will be scanned. You

I'm not sure about earth class mail, but Swiss Post Box will deliver them. Using the default settings, if I'm not mistaken, only envelopes will be scanned. You then get to decide to either open and scan or physically deliver letters. Scanned documents can be delivered, too, but paperclips or staples may be removed.