The phrase "a post that has" is correct and usable in written English.
It can be used when referring to a specific post that contains certain information or features.
Example: "I found a post that has valuable tips for improving productivity."
Alternatives: "a post containing" or "a post featuring".
President Barack Obama today named New York City's health commissioner, Thomas R. Frieden, as the new director of the Centers for Disease Control and Prevention CDCC)—a post that has been vacant since the departure of former director Julie Gerberding in January.
Sophie Kelly is joining Barbarian as president, a post that has been vacant at the agency.
Mr Peña has appointed him minister of public administration, a post that has been vacant for more than two years.
But they nevertheless find it wrenching to leave a post that has consumed so much of their lives.Engineering joyCan anything be done about this epidemic of unhappiness?
(Suleiman has been made vice-president, a post that has been empty for thirty years, since Mubarak left it to become President after Anwar Sadat was assasinated).
There are also several promotions and shifts among senior managers, as well as plans to fill a post that has been long vacant, that of global creative officer.
"This Pregnant Model Is So Insanely Fit She Has Pregnancy Abs" was the BuzzFeed headline for a post that had been viewed close to two million times.
Mark Herrington joined Shoutlet, Madison, Wis., as chief executive, a post that had been vacant since April.
Jim Silburn joined Colle & McVoy, Minneapolis, part of MDC Partners, as director for client services, a post that had been long vacant.
Jay Russell, managing group creative director, was named executive creative director, filling a post that had been vacant since early last year.
Rebecca Van Dyck joined Levi Strauss & Company, San Francisco, as global chief marketing officer, a post that had been vacant.
