The context or subject of the email is not provided, so it is difficult to determine what exactly is being agreed upon. However, based on the limited information provided, it can be inferred that the sender is expressing their agreement with something discussed previously.

In terms of length, the email is extremely short and lacks any substantial information or details. Therefore, the extracted summary will also be brief.

Based on the content of the email, it appears that the sender is in agreement with a certain topic or point of discussion. However, without further context, it is impossible to determine the specific subject being referred to.