Hi. Long time lurker, first time writing!

I've just recieved an email from a woman supposedly from Deposit Photo wanting one of my photos. Has anyone else been approached this way? Email goes like this

my name is Olesya.
I know you've been delivering your images to Depositphotos and than decided to cooperate with Istock platform exclusively.
Hope its going great!
Our big European client has interest in your image, and as far as we have an agreement, the image can be purchased via our platform only.
They are interested in  RM, non-exclusive purchase for 2-3 years, for �1800-2000. We can offer you 35% from the deal.
Please give me a feedback if you can upload this image asap.

The email comes from an @depositphotos.com so I'm assuming it's legit. They sent another email not long after with a link to the photo they wanted.

Is it worth it? The image isn't exclusive to iStock and is on another site. It's made a few small sales, but hasn't attracted that much interest.

Has anyone else been approached this way? And what was the outcome? I've emailed her back just to see what they are really offering.

Thanks for any advice.