USCIS announced on March 27, 2020, that it was automatically extending Requests for Evidence (RFEs) and Notices of Intent to Deny (NOID) deadlines for certain people. These deadlines are common for people applying for benefits, such as adjustment of status, where USCIS asks them to submit additional evidence for the case or indicates that the agency intends to deny an application. This notice only extends deadlines for RFEs and NOIDs dated between March 1 and May 1, 2020, so it is prospective in nature. The extensions are for 60 days after the response deadline listed in the RFE or NOID.
It is recommended to save the mailing envelope for any such notice because there are common problems that arise in these circumstances, such as undated letters.