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Config Lab
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Config Playground

Write your header + body config on the left using our tokens. The preview on the right renders it live — the full HTML, exactly as it will look.

Config

Graded Exercises

Five exercises, in order. Write the config, press Check, and fix what it tells you. Progress is saved in this browser.

MIME Visualizer

Pick a message shape and see how the parts nest and how the boundaries are written.

Structure

Raw skeleton

  







  
Sending Cycle Simulator

  
See how X-Delay, Change IP After Sending and Wait fit together — then calculate Repeat Data and Sent By for your own numbers.

  

    
Normal method, visually

    

      

      

    

  

  

    

      
Repeat Data calculator

      

        
        
        

      

    

    

      
Sent By calculator (Customize)

      

        
        

      

    

  







  
Quiz

  
Ten questions on the concepts. Pick an answer to see if it's right and why.