An IT worker in Warsaw, Michal Szybalski, has declared the mail in his town is slower than a snail.
This declaration came after he received a letter in the mail on the 3rd of January postmarked December 20th. The point of origin was 11.1 km from its destination.
Calculating the time and distance traveled, he found that the letter traveled 0.03775 km/h from it's origin over 294 hours. Afterwards, he calculated a garden snail travels at 0.048 km/h.