what is "relay" I don't know what it is, therefore it is a good chance it is the problem really.

SMTP relay it use to send 100+ mails by one Id and host also....

You need to post more information here to describe your issue, step by step, field by field of what you are typing and seeing. Screen shots will help.

i'm using Thundrbird from last 6 months on SMTP but i have done project in my collage of Send 1000 mails in one day that's reason i have use Relay to send more then hundred mails but i face issue like i'm send mail by Relay protocol then i found copy in inbox also i want to stop this copy because it's effective for my hard disk space

I think your issue might be more related to your SMTP relay service than Thunderbird. What service are you using?