Here's the full episode of Season 14, Episode 17 of Family Guy, Take a Letter! *Happy 5th anniversary*

Plot: To pay for Stewie’s private school, Lois becomes a postal worker. She finds a letter from Peter that was never sent to his old fling, Gretchen, dated a week before their marriage. When Gretchen tries to come between Lois and Peter, Lois has a plan of her own.