# Transactions and delivery guarantees


The RabbitMQ transport supports the following [transport transaction modes](/transports/transactions.md):

 * Transport transaction - receive only
 

## Transport transaction - receive only

In `ReceiveOnly` mode, messages are consumed in manual acknowledgment mode. Successfully processed messages are acknowledged via the AMQP [basic.ack](https://github.com/rabbitmq/amqp-0.9.1-spec/blob/b8e975a762b8677263ebbbba1e70654b5263af81/xml/amqp0-9-1.xml#L2565-L2594) method, at which point the broker will remove them from the queue. Failed messages that need to be retried are re-queued via the AMQP [basic.reject](https://github.com/rabbitmq/amqp-0.9.1-spec/blob/b8e975a762b8677263ebbbba1e70654b5263af81/xml/amqp0-9-1.xml#L2598-L2658) method.

> [!WARNING]
> If the connection to the broker is lost before a message can be acknowledged, even if the message was successfully processed, the broker will automatically re-queue the message. This will result in the endpoint processing the same message multiple times.