1. Put in UV lights, and run them at intervals throughout the day. Add UV reflective coatings on many surfaces so that light can be reflected into corners under and around machines.
2. Require new mail equipment to be designed to be illuminated fully inside and easily cleaned, reducing the number of places that organisms can hide from cleaning agents or light.
3. Cycle the humidity in the building to 100% a few times a day, so that spores will germinate and become vulnerable.
4. Put electrostatic air filters at many places in the facilities.
5. Add air-containment shrouds to equipment so that air surrounding the mail is captured and run across electrostatic filters.
Allow and encourage postal customers to opt out of 2nd- and lower class mail. This would reduce the amount of paper being delivered.