United States Postal Service at 2400 Old Milton Parkway, Alpharetta, Georgia.

Do not bother hand canceling here! I stopped by to hand cancel my wedding invitations. After patiently waiting in line, I asked the lady if I could hand cancel my invitations (myself) so they would not be put through the machine and potentially damaged. She gave me the pressing stamp and I hand canceled all of them on the side before returning them to her. They were ready to be sent out. I happened to see a family member's unopened invitation later that week, and saw it had been put through the machine canceler. Ink was smudged on the outside of the envelope and over our return address. I was so disappointed I wasted my time and a trip here, especially after putting so much effort in my invitations. If you're looking to hand cancel something important- don't do it here!