. OP previously had a tx output to a destination address that contained the first and last character digits that identical to mine (a rare coincidence).
As an illustration:
A1b2Cdfdruirj4grhg2urh5ggriorjf3D4e5F : belongs to OP
A1B2c1jijrj5ofmmf8jkfidk0mawq3d4E5F : mine
We have never done any business before, I'm wondering how my address ended up on his clipboard. As you can imagine, that it is really very deceptive for users who are used to rushing, it took me a few checks before I noticed the difference.
Very interesting to see that both address first and last characters are same and we often checking only these two before sending payments. This story makes me more cautious and now I will check full address before sending payments. OP is so luck that the sender address owned by reputed member otherwise lost was confirmed. OP can better gives reply that how he copied address but I think OP copied you Proof of Authentication or something where he copied your address too.
I sent two times fund to contract address instead of exchange address by mistake and lost forever. we should also double check our wallet, not only first and last. Hackers are also doing this track when they hack keyboard. you will be satisfied after confirming last characters but you should be smart here to save your fund.