From a reader:
I have heard from a solid priest-friend that attending an SSPX Mass is perfectly permissible for a Catholic in good standing, and such a one can even there receive communion. Today I was to go to an EF Mass at a Catholic church, but due to unforeseen train delays this was not possible. I was with friends, as I am in a new environment, and they suggested we go to the SSPX church. Even though I felt uneasy, I went along, thinking that it was probably all right (indeed, they did not seem worried, even though I was). Does this suffice to fulfill my Sunday obligation?
The Code of Canon Law for the Latin Church says:
can. 1248 1. The precept of participating in the Mass is satisfied by assistance at a Mass which is celebrated anywhere in a Catholic rite either on the holy day or on the evening of the preceding day.
This means that if you go to a chapel of the SSPX on the day of precept or the evening before and attend Holy Mass, you fulfill your obligation. The SSPX celebrate in a Catholic Rite.
However, I do not recommend that people do this frequently, because frequency can undermine their unity with the Roman Pontiff. The risk of this erosion of unity could in part depend on the manner of preaching and many other factors.
Also, I will not recommend reception of Holy Communion at an SSPX chapel at this time, unless the conditions of your life are such that it would be very difficult to get to another church or parish actually in union with the local diocese and Rome. The obstacles must be serious, but they cannot be easily spelled out because the circumstances of people’s lives differ so much.
So, yes, you all fulfilled your Mass obligation. However, I will not go so far as to say that attendance at a SSPX chapel is “perfectly” permissible. It is permissible under certain circumstances.
If it were “perfectly” permissible, then the Holy Father would not be so concerned about bringing them back into clear unity with him and his successors.
Thank you for being concerned enough to ask. This question comes up fairly often and it bears review.