How to remove an IP address from email blacklists

Once I had to remove from the blacklists IP addresses of different dedicated servers located in data centers, since some mail services did not receive emails from them, due to the fact that the previous tenant did not use the IP address honestly or had viruses, spammed, and the current one got locks.

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Fn function keys on a laptop work the other way around

Usually, to extend the functionality, there is a special Fn key on laptop keyboards.
If you hold it and press keys, for example, from F1 to F12, then they will perform completely different functions, change the screen brightness, volume level, put the system into sleep mode, turn off/on the Wi-Fi adapter, etc.

But in my case, everything was the opposite, when I needed the F1-F12 keys, instead of them, functional ones worked, which usually work with the Fn clamped, and to press F4 for example, I had to clamp the Fn key as well.

As it turned out, the BIOS had an option Action Keys Mode (in Lenovo laptops – HotKey Mode), the default value of which was Enable, which resulted in the function keys working without pressing Fn.
To make the F1-F12 keys work as usual, set the value to Disable.

By the way, if your function keys do not work at all, then rather the driver is not installed in the system.

See also my article:
Why do Mac function keys work without fn and instead of F1-F12

Facebook blocks users after registration

Once used the social network Facebook, deleted the account and a year later, maybe a little more, decided to re-register.
It was around December 2017.
After the registration, I added one photo, Facebook offered to add friends. In the list of suggested friends, I added a couple of friends, and on several unknown people I clicked a cross, hoping that they would not be offered Facebook, I began to correspond with friends, and after a while the message was displayed that the account was deactivated and you need to attach one more photo.
I attached the photo, in the course of the day the account was activated, but after a while it was deactivated again, added the same photo – activated, I was asked for a photo of the passport for the third time, added – activated, later deactivated again and asked for another simple photo, after that the following message was displayed:

You Can’t Log In Right Now.
When we study your photo, we will contact you. For security reasons, we will now exit Facebook from you.

This message was displayed for about two months from 12.2017 to 02.2018, then it was generally displayed that the account was blocked.
Several times i wrote in technical support that he was blocked by mistake.
With the email that was used when registering the account it was impossible to register again, so I had to wait and on 06/03/2018 it was finally unblocked.

But I was already disappointed by such weak technical support and crooked locking algorithms, so I just deleted the account.
See also my article – How to delete a Facebook account?