Gmail / google security block

I set up an email notification using my gmail account. Google responded with the the following:
Google will continue to
block sign-in attempts from the app you’re using because it has known security
problems or is out of date. You can continue to use this app by allowing access to less secure apps, but this may leave your
account vulnerable

Just curious on your take on this.

Hi Adrian,
Yes, that is correct. For the moment we only use the lower level of security. It is on the to-do list for the moment so i am not sure about the future.

Many Thanks for your reply