How to deal with blocking login to gmail through a mail client when changing geographic location?

Question

gmail

Situation - there is an email client that a couple of people have access to (either web access or via Thunderbird - POP). One person moves around the country (Russia) and uses the mail only through the mail client. In the new location, when checking mail, the client reports that they say incorrect authentication, enter the correct password.
The password is entered correctly, but attempts are in vain.
After entering the mail through the web interface, and then checking the mail through the mail client, there are no problems.
In a new city (many hundreds from the previous one), the situation repeats itself - the client does not allow access to the mail. After a successful web login, the client successfully receives and sends mail.
What could it be and how to overcome it?
Maybe some kind of google security system, but I can't find its setting anywhere.

Answer 1

All right. With a sharp change in geography, Google blocks the connection. Even the report comes like:

Answer 2

Unfortunately, there is no setting for this case.
I have an idea how to try to appease Google:
1. Enable 2-Step Verification.
2. Connect mail to Thunderbird using the application password, after enabling the first item, the page for generating them is located at this address: https://accounts.google.com/b/1/IssuedAuthSubToken...
3. Log in to mail from both computers through the Web interface by entering the verification code from the phone + checking the box so that Google remembers you for several weeks.
In practice, I have never had problems with applications that are tied through an application password. Even when the account was simultaneously tied to 3 devices that were in Moscow, the Moscow region and Thailand at the same time.
Well, a small bonus is that you can always log in by entering a confirmation code from your phone or generate login codes using a special application or having printed one-time passwords.
I also had a funny incident with Google: there was an old account from which mail was collected on a new one (using standard Google tools, which is important). It was necessary to go to the old one after a long time, but he does not let him in: enter, he says, your usual location. I enter all possible cities - no, I do not believe. I'm starting to think about how. As a result, he introduced the USA - ok! It turned out that he counts the visits of his mail collection bot as a regular visit :)