The DMMS mail collection and delivery services are performed each business day (Monday - Friday, excluding Federal Holidays) for all scheduled delivery locations, both on and off campus in Bethesda, Gaithersburg, and Rockville.

To sustain accurate and expeditious mail delivery services, NIH activities should notify the Mail Customer Service Branch in writing as soon as possible of a pending move. Include in this notification when mail delivery should be stopped at the old location and started at the new location. Also include a list of the employees who should receive mail at the new location.