Found in every zone, these give you access to your mail.
In seven specific zones, you can use WorldSearch to locate the "Mailbox", but only in those 7 zones. They are:
- Sascilia Steppes
- Elven Island
- Coast of Opportunity
- Tergothen Bay
- Yrvandis Hollows
- Wailing Fjord
In all other zones, the Mailbox cannot be searched for, but POIs with a Mailbox will tell you where it is if the wiki has it marked on a POI page. Almost every zone in the game does have a mailbox, somewhere.