I I remember right there is a minimum. But I am sure you don't loose what you sent,it is just like pending.Another thing is that you will not have problem sending 5 ethers
I did that many times in past to check if the transaction will happen
Ok I think I know what my problem is, apparently I am sending wei and not ether. The minimum ether to send to Poloniex is 0.05. That is why is not showing up on my Poloniex account.
The command I used to send one wei is:
eth.sendTransaction({from: 'MyEtherAccount', to: 'MyPoloniexAccount', value: 1})
If I go to the blockchain I do see all the transactions in wei (7 wei total, 1 ether is like 1,000,000,000,000,000,000 wei)
My question now is how do I send ether instead of wei?
Thanks