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Mailboxes are a queue of messages with guaranteed ordering. Mailboxes have a set of useful properties that make them really powerful:

  • Mailboxes are partitioned. It means that messages are distributed through partitions, and subscribers can read from different partitions.
  • Mailboxes are dynamic. You can subscribe and unsubscribe from a mailbox many times.
  • They guarantee ordered/only once delivery. Even if an actor can process the same message more than once (depending on the recovery strategy), the message will be only delivered once by the mailbox.