This is just a spike for demonstration. It could be re-written better in many ways.

log_count.rb

#!/usr/bin/env ruby                                                                                                                 
                                                                                                                                    
file_string = File.read('mail.redact.small')                                                                                        
line_array = Array.new                                                                                                              
file_string.each_line { |line| line_array << line }                                                                                 
                                                                                                                                    
uid_array = Array.new                                                                                                               
line_array.each do |line|                                                                                                           
  split_line = line.split                                                                                                           
  uid = split_line[3]                                                                                                               
  next unless uid.match /\:/                                                                                                        
  uid_array << uid                                                                                                                  
end                                                                                                                                 
                                                                                                                                    
success_count, deferred_count, bounced_count, other_count = 0, 0, 0, 0                                                              
uid_array.each do |uid|                                                                                                             
  line_group = Array.new                                                                                                            
  line_array.each do |line|                                                                                                         
    if line =~ /#{uid}/                                                                                                             
      line_group << line                                                                                                            
    end                                                                                                                             
  end                                                                                                                               
  if line_group.join =~ /status=sent/                                                                                               
    success_count = success_count + 1                                                                                               
  elsif line_group.join =~ /status=deferred/                                                                                        
    deferred_count = deferred_count + 1                                                                                             
  elsif line_group.join =~ /status=bounced/                                                                                         
    bounced_count = bounced_count + 1                                                                                               
  else                                                                                                                              
    other_count = other_count + 1                                                                                                   
  end                                                                                                                               
end                                                                                                                                 
                                                                                                                                    
p "#{success_count} email sends succeeded"                                                                                          
p "#{deferred_count} email sends were deferred."                                                                                    
p "#{bounced_count} email sends were bounced."                                                                                      
p "#{other_count} email sends have other or no status codes."