Gmail vs "drunk" letters
The Gmail mail service has a very interesting feature, the purpose of which is eloquently described by the developers themselves. This is a kind of “stub” that does not allow you to send a letter until you solve several arithmetic problems with a ticking timer.
Of course, these tasks are not from the “Enter any 11-digit prime number to continue” series, but much easier. But still, the very fact of solving these problems clearly indicates that the person, at least, is in a clear mind and is determined to send a letter to the address.
By default, the Mail Goggles function is activated only late on weekends, that is, when the probability of sending "drunk" emails is especially high.
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However, these settings can be easily changed under your own schedule. In the same place in the settings and the complexity of the tasks.
Of course, these tasks are not from the “Enter any 11-digit prime number to continue” series, but much easier. But still, the very fact of solving these problems clearly indicates that the person, at least, is in a clear mind and is determined to send a letter to the address.
By default, the Mail Goggles function is activated only late on weekends, that is, when the probability of sending "drunk" emails is especially high.
')
However, these settings can be easily changed under your own schedule. In the same place in the settings and the complexity of the tasks.
Source: https://habr.com/ru/post/41762/
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