The Domestic Russian Mail service, or Pochta , works reasonably well if you need to mail something inside the country.
Branches are numerous, and usually feature telegraph and telephone services.
Your local post office also offers postal and telegraphic money transfers within Russia. If you need to send something quickly between one city and another, it is usually possible to send envelopes and packages with a train conductor. Take the item to be shipped to the train going to that city, and find a conductor willing to take it for one hundred rubles or so, depending on the number of packages. Call the recipient and tell them the train and car number, as well as the conductor s name so that and they can go and meet the train when it pulls in. Be sure to confirm beforehand that your recipient can meet the train.