You would be better off going paperless/email.
A couple of years ago I mailed 6 bills to different locations from one mailbox. NOT ONE OF THEM MADE IT.
I complained VERY LOUDLY & OFTEN to the USPS and they did not respond in any manner and did absolutely NOTHING.
Paranoid thought: They might have done something. You might be on the Department of Homeland Security's domestic enemies list. Can't have obstreperous subjects, can we?