code: public OverallVolume withDomainIspPlacements(DomainIspPlacement... domainIspPlacements) {
          if (this.domainIspPlacements == null) {
              setDomainIspPlacements(new java.util.ArrayList<DomainIspPlacement>(domainIspPlacements.length));
          }
          for (DomainIspPlacement ele : domainIspPlacements) {
              this.domainIspPlacements.add(ele);
          }
          return this;
      }
docs: <p>
  An object that contains inbox and junk mail placement metrics for individual email providers.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setDomainIspPlacements(java.util.Collection)} or {@link #withDomainIspPlacements(java.util.Collection)}
  if you want to override the existing values.
  </p>
  
  @param domainIspPlacements
  An object that contains inbox and junk mail placement metrics for individual email providers.
  @return Returns a reference to this object so that method calls can be chained together.