This was part of a recent e-newsletter by email:

https://www.irs.gov/newsroom/irs-statement-providing-meaningful-assistance-to-taxpayers-in-the-curre...

"As part of this ongoing effort and balancing the importance of protecting the interests of tax administration, the IRS has also been taking important steps to modify our operations and provide additional taxpayer relief. These efforts include suspending issuance of certain automated notices and related actions. We are looking at the suggestions that have come in, and we will continue modify and adjust our efforts going forward to help taxpayers and the tax community.

For example, we have already decided to suspend notices in situations where we have credited taxpayers for payments but have no record of the tax return being filed. In many situations, the tax return may be part of our current paper tax inventory and simply hasn't been processed. Stopping these letters — which could have otherwise been sent to thousands of taxpayers — will help avoid confusion.

It is important to appreciate that many IRS notices are statutorily required to be issued within a certain timeframe to be legally valid. This means they must be sent, absent congressional action. We will continue to explore areas where the IRS can make changes and are in the process of reviewing the full set of notices that we send to determine where we can make adjustments while we continue to work through unprocessed returns and taxpayer correspondence."

In other words, it would take an act of Congress...