If you want to be really safe, you should be aware that the brewing process of Namibian beer is known to kill all contaminants. All the major towns have internet access, although its not always very fast or reliable. Newspapers The best newspaper in Namibia is definitely the English language paper, The Namibian. It is published on weekdays and covers both local and regional news, although travelers may find its international coverage a bit skimpy. The Observer is published on weekends and is worth a read if you're into the more sordid details of Namibian society, other dailys include the Afrikaans, Republikein, and German, Algemeine Zeitung International and South African papers are available at larger newsagents, the CNA in Windhoek's Kalahari Sands shopping centre is a good place to look.
All major centres have a post office which is open during normal bossiness hours.
Mailing from Namibia is fairly reliable, but be warned that surface mail is very slow. Mail to Namibia is unpredictable and an airmail letter from Europe can take anything from three days to three months. As Namibia does not have a delivery service your address should always contain a post box number. Letters that are incorrectly addressed and only contain a street address will only arrive if the post office can trace the name on the letter to a post box, this can take months. Namibia has particularly beautiful stamps, these are available at the philatelic section of the main post office in Windhoek.