That said, Greek Orthodox
Metropolitan Kallistos Ware acknowledges several schools of thought among the Orthodox on the topic of purification after death. This divergence indicates that certain Catholic interpretations of purgatory, specifically the satisfaction model, more than the concept itself, are what is universally rejected. Also, there are Orthodox sources that indicate some sins can be forgiven after death
[2];(Mt 12:32) but which also reject the teaching of purgatory because of the doctrine of indulgences and idea of literal purgatorial fire that are tied to it. Still other Orthodox hold to the notion of the Toll Houses and that those who pass through them after death have no assurance of final salvation.
Rather than say that the doctrine of Purgatory is a heresy, it is more accurate to say that it is an ancient ecumenical tradition which, due to the mysterious nature of the subject matter, Christians throughout history have interpreted and explained in a very wide variety of ways, some of which were strongly rejected by Eastern Orthodox Christians.