My understanding was that you could receive at an Orthodox Church (or SSPX, or anyone else who believes in the Real Presence) if you are there for the Mass (like a wedding or funeral, for example)if you are specifically invited by the presiding priest.
I certainly hope this is the case, because we have dear Russian Orthodox friends whose five children's weddings we attended and we received Communion after being specifically invited to do so.
An error was made if you took the "GIFTS", as he called them. As my nephew, who is Orthodox told me not two days ago.... one must be an actual, recently confessed Orthodox Christian to take the Sacraments.
He said a Priest was suspended for giving the sacraments to those at a wedding who knew were not Church members.
Also, he added that in some Orthodox Churches you MUST have confession on the morning you take the Gifts as he called it. Not to mention, they must refrain from eating meat on Wednesdays and Fridays every week.
There is NO mutual communion between the two Churches... as much as the RC would like to think that there is.... there just is not. That is what brought up the discussion between us. My daughter and son-in-law are RC and we were having this very talk.
My nephew and his new wife are converts to the Greek Orthodox Church and he is considering attending seminary next year. If not to be a priest, he wants to be a youth counselor at the Church.