Hello,
I've send 0.01 BTC to an address to check the system is working (auto generation of address) without any fee and it is. But now I cannot send my 0.01 BTC back because it request a small fee of: 0.005 BTC. I've tried with the GUI and RPC and it is the same behavior : "Error: This transaction requires a transaction fee of at least 0.0005 because of its amount, complexity, or use of recently received funds". Ok now I would like to understand why is there such a limitation (I mean why didn't have I to pay a fee for the 1st transaction but only for the 2nd?)? Is there a way to send them anyway and wait even if it has ridiculous low priority? It's been 3 days that I test it so the "recently received funds" should have expired?
I guess it should be possible to send them anyway if you modify the client. Or just wait a few more days. It's just 0.01 BTC and they won't go anywhere.
An other short question: Can someone sends bitcoins to an offline generated address and the address owner check he received them when he is online again? If yes it should means that when my client generates a new address it don't needs to broadcast it or inform the Network.
Yes, it's possible to receive bitcoins on an address that has never been connected to the network. It's also possible to send btc to non-existing addresses that are in the correct format (we had that question in another thread yesterday).