Monday, December 17th is the United States Postal Service's busiest mailing day of the year.
And if you haven't got your holiday cards or packages into the mail yet, here are the absolute last days you can send them off with guaranteed delivery by Christmas:
Dec. 3 Priority Mail International
Dec. 11 Express Mail International
Dec. 14 Parcel Post
Dec. 20 First-Class Mail
Dec. 21 Priority Mail
Dec. 22 Express Mail
Check out the video as FOX 2's Amy Andrews takes us to the Royal Oak Post Office.
And for more information on mailing your holiday surprises, visit www.usps.com.