The theme launched by UPU on World Post Day 2023 is "Together for Trust: Collaborating for a Safe and Connected Future". This theme emphasizes the importance of trust and collaboration in creating a safe and connected future for everyone. The UPU encourages member countries to organize their own national activities to celebrate World Post Day, including the introduction or promotion of new postal products and services, open days at post offices, mail centers, and postal museums, and honoring national winners of the UPU International Letter-Writing Competition. The UPU also provides member countries with promotional materials, including posters, social media kits, and branded materials, to help them amplify the global World Post Day campaign.