Hello,
we are offering a free online SaaS which also has the ability to upload pictures.
This has now been abused for the first time by a 'spamvertisement' - so someone sending emails from a different server but in these email using images uploaded on our SaaS server.
Is there a tool to reliably detect spamvertised images maybe on upload?
Could this be solved server-side? Like blocking all images if they are trying to be loaded from outside our webpage?
Any reasonable ideas would be appreciated.
Thank you in advance
Christian
