U.S. Attorney's Office for the Southern District of Texas issued the following announcement on April 1.
As a temporary measure due to COVID-19 concerns, service on the United States Attorney in civil cases shall be via email and US mail as follows:
A copy of any summons, complaint or emergency motion shall be emailed to USATXS.CivilNotice@usdoj.gov. A paper copy shall be mailed to the Civil Process Clerk, United States Attorney’s Office, 1000 Louisiana St., Suite 2300, Houston, Texas 77002. Hand delivery may not be accepted. Please do not use this e-mail box for general pleadings or correspondence.
Service will not be deemed effected until you receive an e-mail acknowledgement from our office. This emergency accommodation will expire on June 30, 2020.
Ryan K. Patrick
United States Attorney
Original source can be found here.