-> `Exactly once` message processing without distributed transactions can be achieved with any transport using the [Outbox](/nservicebus/outbox/) feature. It requires business and persistence data to share the storage mechanism but does not put any requirements on transport data storage. In addition to that, PostgreSQL transport supports the `exactly once` processing mode when using **SendsAtomicWithReceive** transaction mode [in conjunction with SQL Persistence](/persistence/sql/postgresql-combining-persistence-with-transport.md).
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