If durable subscriber is listening, what will happen if a publisher adds a message to factory ?

Just Publisher sends the message to the subscriber but the publisher cann't wait for confirmation or acknowldgement.And subscriber can get the multiple messages but there is no reliable of delivering the message.

Can someone elobarate on this!

Nothing will happen to durable subscriber,hence publisher can add n number of messages,the fact is as soon as message is deployed in application server,the registered subscriber only  able to listen the message,or else he will be continuing with the previous message.