"Unquestionably Confused" wrote

| Actually, it's not the devices they are "tagging", it's the IP address
| which you are using. If I log in from either home or office where I
| have static IP addresses, I don't get the verification. If I log in
| from any other location, a pass code is sent to my smart phone and I
| have to enter it on the computer before my regular log in credentials
| are accepted.
|

This makes me feel old. I don't use webmail
to begin with. My cellphone, such as it is, is
a Tracphone that I turn on occasionally when
I need a phone booth. The system you're
describing seems like a great idea, but it also
assumes that you own and constantly use
a computer phone. But of course, these days
most people fit that profile.