39 C.F.R. § 955.2 Appeals, how taken.
Title 39 - Postal Service
Notice of an appeal must be in writing, and the original, together with two copies, may be filed with the contracting officer from whose decision the appeal is taken. The notice of appeal must be mailed or otherwise filed within the time specified therefor in the contract or allowed by applicable provision of directive or law.
Title 39: Postal Service
PART 955—RULES OF PRACTICE BEFORE THE BOARD OF CONTRACT APPEALS
§ 955.2 Appeals, how taken.

