postrsd was updated to release 1.11 [boo#1180251]:

  * Drop group privileges as well as user privileges
  * Fixed: The subprocess that talks to Postfix could be caused
    to hang with a very long email address. [CVE-2020-35573]

- Update to release 1.6

  * Fix endianness issue with SHA-1 implementation
  * Add dual stack support
  * Make SRS separator configurable