How to make a sandwich bread with a very soft crust? And what is the ideal temperature to bake sandwich bread?
Use a Pullman loaf pan (aka Pain de Mie pan). You'll also get a square loaf great for sandwiches. Grilled cheese, anyone?

The lid inhibits a "crusty" crust on all sides, just like a regular loaf pan does on all sides but the top.





I use my 9" Pullman all the time. These are my two favorite, foolproof Pain de Mie recipes.

Honey Oat

White

I don't know that it's always the right temperature for soft crusts, but for those loaves, I always use 350F (175C).