I am applying to mathematics tenure track positions after a postdoc. I have three research letters from professors at Research 1 universities, and each are AMS fellows. One is my PhD supervisor.
My postdoc department is a midrange mathematics department; its on the rise, but doesn't have a big reputation. My supervisor is only familiar with half of my work, while my other letter writers are familiar with all of my work.
Would it be appropriate to use those three letters from other departments, or would it be a warning sign to search committees if no letters come from my current department?