data(msgstr = nil) public

This method sends a message. If msgstr is given, sends it as a message. If block is given, yield a message writer stream. You must write message before the block is closed.

# Example 1 (by string)<<EndMessage)
Subject: I found a bug

Check vm.c:58879.

# Example 2 (by block) {|f|
  f.puts "From:"
  f.puts "To:"
  f.puts "Subject: I found a bug"
  f.puts ""
  f.puts "Check vm.c:58879."
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