When ever I Purchase anything firearms related, from a dealer I am not familiar with, I am always somewhat skeptical, so I'll check around here or do quite a bit of digging before purchasing.
Things like a google map check of their address (in this case it looks like an empty field or possibly a church).
Another big giveaway is terrible grammar, or clear signs of poor translation into English. An example for these guys would be "Please sent to us a screen shot of the payment so we can confirm the payment". There were other examples when I did a fake order on behalf of Richard Head, but this was from the payment portion. Normally it would say "Please send us", not "Please Sent To Us"
Also, with an unfamiliar dealer, read over the site as much as possible for red flags. As these guys say they can ship the ammo in Canada and most states right to your door. Very few if any dealers ship anything to both Canada and US, small things like this should make you skeptical. Same as seeing a site that has everything in stock, where as no reputable dealer in Canada has it, or has had in stock in a long time, and they are selling these hard or impossible to find items at prices way too good to be true.
Another thing, if it's a business, while possible, the E-Transfer would not normally be sent to a personal address such as "Gracekimberly5star@gmail.com", it is possible a dealer doesn't use a business email account, but it should be a red flag until you verify them, and the few instances I have had where it wasn't a business email, it was sent to me either verbally on an order confirmation phone call, or through a confirmation email.