When these melancholy chores were done, he would return to his patient scraping at the letter slot.

When Croom asked where the letter slots were, Harry didn't know.

"Why did you not put it in the letter slot, for God's sake?"

It had been very upsetting, listening to that sound come to her through the letter slot.

I walked to the letter slot, which informed me that the next pickup was tomorrow morning at eight.

Someone must have put it through the letter slot.

Here, Mann produced the envelope and dropped it in a letter slot.

The investment broker dropped his message into the letter slot beneath the grimy, cobwebbed window.

Or maybe it was the letter slot in the front door, which Rebecca knew had come loose.

Its huge doors open to reveal a pull-down table, shelves and letter slots.