Deutsche Post offices are scattered throughout Berlin. Most branches open between 8am and 6pm on weekdays, with reduced Saturday hours and closed Sundays. The main branch at Hauptbahnhof keeps longer hours.
A standard letter within Europe costs around EUR 1.10, and to North America around EUR 1.80. Stamps are available from post offices, newsstands, and the yellow vending machines outside branches. Look for the distinctive yellow signage and postboxes.