Hi,
I recommend the following change in the file ~/.electrum/config
{
     "coin_chooser": "Privacy",
     "proxy": "socks5:localhost:9050"
}
"Attempts to better preserve user privacy.  First, if any coin is spent 
from a user address, all coins are.  Compared to spending from other 
addresses to make up an amount, this reduces information leakage about 
sender holdings.  It also helps to reduce blockchain UTXO (unspent 
transaction outputs) bloat, and reduce future privacy loss that would 
come from reusing that address' remaining UTXOs.  Second, it penalizes 
change that is quite different to the sent amount. Third, it penalizes 
change that is too big."
Routing transaction relay through Tor is only part of the solution. The 
blockchain is a public ledger that can be analyzed anytime after the 
initial transaction broadcast. Private coin selection impedes 
correlation of transaction inputs and outputs that could link back to an 
identity. Tails should set the coin selection to privacy in Electrum by 
default to protect Tails users.
Please Cc me with any replies. I am not subscribed to the list.
Cheers,
Michael English