The Post Office, located at https://afternoon.dynu.com/ was operated by capey and was established possibly in 2013. Died 2025. The software was originally written by TableCat and has since gone under extensive modifications.
The denizens of the PostOffice were an InternetCult known as the Post Office Butterflies (POBF). Be very warned, they are not as sweet as they may appear.
PostOffice hosted several malicious cloans (^?!*1) that SHOULD BE AVOIDED AT ALL COSTS:
editorial notes:
*1 Cloanz?! Like what? Those are just mirrors. World would be blessed with any good clone of Afternoon/letterbox, because it'll be automatically less mailicious by definition. You can't get more mailicious than current amount of unmoderated shitposts deliberatly allowed by copey