Even if a proposal arrives in a government mailroom by the submittal deadline, the proposal is nevertheless “late” if it does not reach the location specified in the solicitation by the designated time.
In a recent bid protest decision, the GAO reaffirmed long-standing precedent that “receipt of a bid or proposal at a mailroom or other receiving area does not constitute receipt at the location specified in the RFP, provided the agency has established reasonable procedures to ensure that mailed bids or proposals are routed from the mailroom to the location designated in a solicitation for receipt.”