Email Setup with Hikvision DS-7604NI

Hi,

I have managed to set up the email notifications on the NVR, even though I have selected attach pictures, no pictures are being sent.

I read somewhere, that it's worth setting up the email notification on the actual IP camera itself. However, when I select "Test" I get the following message "The network Gateway is not configured. And this may cause the failure of email sending"

I'm not sure what else I can do. I have selected the less secure apps on Google.