I would like to report the same letter I received recently. I was sweating when I saw USPS email notification with a copy of IRS envelope. In the USPS email, you can merely see some numbers like 1445 through a plastic cover of the envelope.
Once I actually received the letter, then immediately opened it. It looked like IRS was beginning to attach Notice 1445 since July 2020 with other documents.
The Notice 1445 is just a general letter saying that "Tax Help in Other Language", which introduces IRS offers tax help in different languages. Another document in the envelope is to thank me to use IRS Online Service. Then I recalled that I registered an online account at IRS to view my previous tax scripts. So, if you registered an online account on IRS, you may receive this letter.
