Carl Pistorius, Oscar's brother, faces culpable homicide charges. The trial is expected next month. He will stand trial in connection with the death of a woman in a car crash in 2010.
Carl has been most active of Oscar's relatives in court - being briefed by lawyers, visiting brother in holding cell and comforting him in the dock.
Carl seemed to be the most anxious of Oscar's relatives as they waited for a bail ruling. They are clearly very close.
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The Information Commissioner’s Office said BT did not have customers’ consent to send the emails.
The 23-year-old was held on suspicion of doing an act likely to cause an explosion to injure or damage property, and endangering safety.
Three men died on the track between Brixton and Denmark Hill in south London.