postal

adjective2

1. •
   Relating to the collection, sorting and delivery of mail.

   • He's a postal worker, and has been in the postal industry for decades.
   • We sell stamps and stationery for all your postal needs.
2. •
   (US, slang) Crazy, insane.

   • SANDI: Maybe I should just have my own party, since you obviously think I'm postal. — 1999