There are small post - office kiosks all over the city that do the basics. Go to the main domestic and international post office in the event that you need to do anything complicated.

Hanoi GPO 75 Dinh Tien Hoang, Hanoi. T: (04) 825 5948, Hours: 06:30 to 21:30 daily. Long Distance services available.

On the southeast edge of Hoan Kiem Lake, just south of Ngoc Son Pagoda and across the street -- you can't miss it. Basic postal services are also available everywhere you see the words "Buu Dien" along the street, and many hotels will handle postal services for you.
http://www.vnpt.com.vn

Domestic post office

Add: 75 Dinh Tien Hoang Street

Tel: 825 7036

Opened: 7am-9.30pm

Occupies a full city block facing Hoan Kiem lake. You can send letters, pick up domestic packages and purchase philatelic items.

International postal office

Add: 75 Dinh Tien Hoang street and Dinh Le street

Tel: 825 2030

Opened: 7am-8.30pm

Has its own entrance to the right of the domestic office.

Private document and parcel carriers in Hanoi:

DHL
Add: 49 Nguyen Thai Hoc street

Tel: 733 2086

Federal Express

Add: 6C Dinh Le street

Tel: 824 9054

UPS
Add: 4C Dinh Le street

Tel: 824 6483