I am running a website on Blogger. Yesterday, I got a DMCA report about a post. Is it important and what should I do?
You are likely aware of the source of the material. Assuming that the DMCA notice is genuine, and only you can determine that, you should remove the identified content immediately unless you have deep pockets and are willing to take on the claimant in court.
Even before that happens, a complaint is likely to be made to your hosting company who will remove the post. So beat them to it, take it down.