Vietnam is well-wired and in most destinations you can easily find a connection in cafes, spas, shops, hotels and restaurants. Free public Internet access is available in several tourist hubs and major airports. Local 3G and 4G packages are an affordable option if you plan to visit remote areas or need to be online frequently.
The Vietnamese postal service is generally reliable, although packages can take longer to arrive than expected and are often held at the post office for pick-up. Mailboxes are uncommon. If you are sending postcards home, give them to your hotel to mail or send them directly from a post office.