Public worker's union Verdi, which called the strike, estimates some 5,000 international packages will be delivered a day late due to the strike.
Verdi is fighting to get the 130,000 Deutsche Post employees a wage increase of seven percent, a hold on operational layoffs until June 30, 2011 and a 38.5 hour work week.
“There is no reason for these strikes,” Deutsche Post spokesperson Uwe Bensien told broadcaster ZDF's Morgenmagazin. “Both parties signaled in the last round of talks that they wanted a solution on the table.”
Bensien said that delivery delays due to the strikes would be “manageable, but annoying.”
On Tuesday, Verdi called a strike for all 83 letter and 33 package centres in Germany.
Acting Verdi leader Andrea Kocsis said that upcoming negotiations are the last opportunity to find a solution, threatening longer strikes.