The federal housing agencies have extended their existing moratoria on foreclosures and evictions to August 31, 2020. See https://www.hud.gov/sites/dfiles/OCHCO/documents/2020-19hsngml.pdf (HUD); https://www.fhfa.gov/Media/PublicAffairs/Pages/FHFA-Extends-Foreclosure-and-Eviction-Moratorium-6172020.aspx (Fannie Mae and Freddie Mac); https://www.benefits.va.gov/HOMELOANS/documents/circulars/26_20_22.pdf (VA).
These moratoria only apply to single-family mortgages. They do not apply to vacant or abandoned property. They prohibit initiating foreclosures, which probably means that a lender cannot get a running start by publishing the notice of sale before August 31 and then conducting the sale on September 1.
The State of Mississippi does not have any moratorium on foreclosures or evictions. The editors are not aware of any moratoria imposed by municipal or county governments in Mississippi.