As Countess said, beware of scammers that might contact you now you've given out your details, who pretend they are from eBay/the seller/the courier 

That is why their is a bright yellow banner right across the top of the page when someone posts something, saying not to give out person details

It is there for the poster's own privacy/safety

This is a public forum viewable to absolutely anyone in the world, including scammers