Not in this context. This wasn't spam, this was a person with the information they had trying to close the loop on some information an engineer put into a a spreadsheet. This message was not "irrelevant" in the context that the person sending it had. This was not a robocall trying to extort money.

As I noted in another thread: A simple response pointing to the license should be the default response to requests like this which can be automated.

Yep, it can/will happen. My assumption is that this is related to Curl, which has a pretty well documented license. Responding to emails like this with an automated email pointing to the license at https://github.com/curl/curl/blob/master/COPYING seems like an obvious thing to have setup.

Namely: THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.