Mix 2 cups flour, salt, sugar and yeast. Add water and beat with electric mixer 2 minutes at low speed. Add 2 more cups flour, mayo and 3 eggs. Beat with mixer at medium speed for 2 minutes. Now stir in by hand enough additional flour ( about 3 cups ) to form a smooth and elastic dough, kneading and adding more flour to achieve this texture. Place dough in a greased bowl and cover and let rise double. Punch down and divide dough in half ( or 3rds for smaller loaves ).Cover and let dough rest 10 minutes. Divide each half into 3 long rope-like pieces. Braid 3 pieces to form a loaf. Place on a greased baking sheet and brush with an egg wash using 4th egg. Sprinkle on poppy seeds etc. Let rise double. Bake in a 375ºF.   for  30 minutes until tested done and nicely browned. Freezes well