Your sentence does not make sense anyway. It should read: Peter hasn't posted the letter yet, but he says he is going to post it soon .
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FreeguyI cannot edit my original post.It's past the time limit. I think you get a couple of minutes to edit, but not forever.
FreeguyPeter hasn't posted the letter since yesterday, but he says he is going to post it soon.Understandable as shown, but it should really be ... ha
FreeguyOne can send "a letter" several times... if it's not the same letter each time.
FreeguySo my claim was bogus.No. What you wrote was reasonable. I just added a small point to clarify it.