Dear <First Name of Poster>:

I <past tense verb showing emotion> your <poem/post/image/letter...>, "<Exact Title>," because... <add 2 or 3 sentences>

One sentence you wrote that stands out for me is: "<Quote from message.>" I think this is <adjective> because... <add 1 or 2 sentences>

Another sentence that I <past tense verb>  was: "<Copy a sentence or line from the post.>" This stood out for me because...

I do/don't <adverb> agree with you that... One reason I say this is... Another reason I agree/disagree with you is...

Thanks for your writing. I look forward to seeing what you write next, because... add 2 or 3 sentences explaining what will bring you back to see more about this person's thoughts.