we don't recognise that email...
So now i will delet it from my iphone?
Email of the person who did the setup?
You can't delete that.
Each Apple device is linked/associated with an Apple ID of the person who did the setup.
Activation Lock prevents anyone who is not the owner from using this iPhone.
To unlock the Phone, you need the Apple ID and password of the previous owner, that were used during set up.
See the following Apple articles:
Activation Lock for iPhone, iPad, and iPod touch
Activation Lock for iPhone, iPad, and iPod touch - Apple Support
How to remove Activation Lock
How to remove Activation Lock – Apple Support (UK)
You can contact Apple support for help -> Get Support (apple.com)
You have to show proof of ownership of your product, provide all documentation showing your purchase of the device.
If you do not have additional proof of ownership, contact the reseller. They may be able to provide the original purchase document.
Once Apple receive your proof of ownership, Apple will further review your request and provide an update.