Duplex Mailing Address Issue

[Javier Pompa]

Looking for advice on tenant neighbor not updating their mailing address.  I own a duplex where occupy one of the units and rent out the other, where my unit has a typical street address and the other unit has a "1/2" street address. The issue is, after asking them, my neighbor/tenants will not update their mailing address to include the "1/2", so I am regularly getting their mail and placing it in their mailbox. Although this is only a minor annoyance, I'd really prefer not to. What is a good way to encourage them to make the updates so that I stop getting their mail?

[Greg M.]

Return to Sender. Not at this address.