I got this email saying to login again since I haven't visited in a long time or to create a new account if i'm a new user and I will receive a $10 account credit.
When I clicked the link the page it takes me to is:
https://www.kogan.com/account/login/?next=/account/dashboard…
The credit/offer expires 11:59 p.m. AEDT, December 19th, 2016.
You might possibly be able to claim the $10 credit as the URL doesn't seem to have any unique identifiers & if it says it works for brand new accounts it should work for anyone really, let me know if it works for you or not :D
Got the same email last week with a $25 credit. Happy days. Thanks Logan.