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A message is considered to be sent if the program increases the counter of sent messages when sending is in proccess. Unfortunately, many users confuse «sent» and «delivered» messages. It is impossible to determine the real number of delivered messages, just as it is impossible to guarantee the delivery of any letter via mail in the real world.
We do not provide the source data on which the charts are based (trade secret), and we do not display too small values (below 2%).