I believe you mean 6 - 11 mBTC, which means 0.006 - 0.011 BTC, that will amount to around 250-450 euro, and it is a very high fee
Exactly, those in electrum are in mBTC, sorry, and electrum itself awares me about the very high fee, so I did not confirm the sending.
I will advice you to send the bitcoin back to your electrum wallet in a way the replace-by-fee is enabled.
How to do that "replace-by-fee" thing and what does it mean? And after this, will I able to get normal fees for sending bitcoins?
Now I have multiple incoming little "coins" from very old mining transiction.
Many thanks for your time!