I run a small business that provides network services for game servers and small websites. We're similar to Ngrok, but much smaller.

I've started receiving informal DMCA take down requests from a large company over email. I've forwarded the request to the user hosting the content but they claim they are not hosing copyrighted content. I only provide networking services and their content is behind a self hosted login. Because of this I have no way to verify if there is actually copyrighted content being infringed.

I'm not sure what to do. My thought is to request the big company make a formal DCMA take down request and I will comply with it. Is that going to cause my a huge headache? Do I need to talk with a lawyer? Should I just bow down to the big company and do what they ask? I don't want our users to host copyrighted content but I also don't want to shutdown small websites because a big company thinks they're doing something wrong. The user is on our free tier if that matters at all.

Thanks for reading, hopefully you have some wisdom to share.

informal: They don't include all the required details listed here: https://en.wikipedia.org/wiki/Online_Copyright_Infringement_Liability_Limitation_Act#Notice_from_copyright_owner