[...] that there is something like an attack? I dont think this is an attack, if the wallet gives error when sending more then 10 coins.. Yes people will send many transactions, this is not an attack. There is no choice, i can also not send 1.000.000 in 1 transaction, i need to split it up to many transactions, and even then it goes wrong. [..]
It is an attack if you send thousands of malicious Transactions with 0 fee (Minimum Fee is 1 QWC). Transactions below 1 QWC will never be confirmed.
Its an attack to flood the memory pool.