How do I know if a transaction is legit? A sender confirmed by email that he sent out bitcoins and even provided a link to the transaction on blockchain. I was never able to find it on blockchain. Just like it doesn't even exist. I talked to him and he told me it was suspended by miners.
I don't know much about this but this just sounds like a huge scam.

Can anybody help me please? Thanks

Blockchain was: 5a48441b1c47812d3a2ba01f30316c2ec6ee8969634ff304650560689a7cf3a3
I've just checked on three different blockexplorers, and none of them knew about this transaction. Your sender may have tried to pay you, but they definitely didn't succeed, so it's up to them to remedy that.

You know that a transaction is legit when it was confirmed in a block and the money has actually been transferred to you. Before the transaction is confirmed, it's merely a payment promise.