In account settings, I set my email address to send me a copy of message. When reply for same conversation the emClient set another time my email address.
If you set a BCC copy to your same email address as you usually use, you will get an additional copy sent to you.
This BCC copy function is meant for when you want copies of your emails to be sent to another person automatically.
when I find the problem on another time I will do a printcreen. Thanks