They did not in my case. Here is the UA string. It looks like a normal client a user might have: 74.51.221.37 - - [19/Aug/2021:22:05:16 +0000] "GET /validate/e

They did not in my case. Here is the UA string. It looks like a normal client a user might have: 74.51.221.37 - - [19/Aug/2021:22:05:16 +0000] "GET /validate/email/1d00a5c2648c211befd33f5a8a7cbfab HTTP/1.1" 404 0 "" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.107 Safari/537.36" $ dig -x 74.51.221.37 +short cache.google.com.