Postcard

Postcards are a collectible introduced with The Sims 4. The only way of collecting them all is by befriending multiple pen pals by writing them letters.

Before a Sim can write letters however, they have to find a pen pal first. To do that, the player has to locate the "Socialize" menu point on the computer's pie menu and choose "Find a Pen Pal". Afterwards, the player can get that same Sim to check their forum post for any replies. If the Sim gets in contact with someone, a notification will confirm this. After writing a letter to their pal, the option to ask for a postcard will appear. When the option is chosen, there will be a chance that the Sim receives a postcard in the mailbox the next day.

Reward
After collecting all postcards the player receives the "My Pen Pal" award, which is a plaque that can be hung on a wall.

Trivia

 * The description of Lucky Palm's postcard is a reference to the phrase "What happens in L.A., stays in L.A.".
 * The description of Dragon Valley's postcard says "Here be Dragons!", which is a medieval practice of indicating danger by putting pictures of dragons and sea monsters on maps.