Sorry for necroposting in this topic, but I joined recently and I find the implications of this topic really interesting.
Being a diocesan priest in the Netherlands, I have a SSPX parish very nearby, in Gerwen. I have of course contact with people who also attend Mass at SSPX but I always warn them not to receive Communion... why not?
The problem with people attending Mass at SSPX is not the validity of the Mass, since the ordination is presumably valid. And so people attending Mass at SSPX have no problem with sunday obligation. If only they don't receive Communion, which is no obligation of course.
Because.. even while the excommunication of the SSPX is lifted, the suspension
of all the priests and bishops isn't... And it's a suspensio a dvinis
. That is the reason for Rome not wanting SSPX to ordain new priests, and Abp Müller was so angry on the SSPX in Zaitskofen for the same reason. And he is right imo.
And therefore the Mass at SSPX is valid, but still illegitimate...
And therefore, even while the confession at SSPX is valid in death peril because the ordination is valid and the suspension rules are so (CIC 1335), a SSPX priest can never have jurisdiction because of his suspension. A suspended SSPX bishop is also suspended from giving jurisdiction. Jurisdiction is a legal matter of course, and suspension makes every act of priesthood illegitimate, even if it is valid.
And so the faithful who want to receive holy communion in a SSPX church need to go for confession to a not-suspended priest with jurisdiction. Confessing to a suspended priest is valid, but a sin in itself of course and so...
Matrimony is not valid in a SSPX church, not just because of the suspension of the priest which makes him not a legal celebrant, but also because the local parish priest needs to give faculty for the validity - which is impossible because of the suspension. (Can. 1108 §1. Only those marriages are valid which are contracted before the local ordinary, pastor, or a priest or deacon delegated by either of them, who assist, and before two witnesses according to the rules expressed in the following canons and without prejudice to the exceptions mentioned etc...) So...
Baptism is valid of course, although illegitimate. A suspended priest can never be the required celebrant.
And therefore, there is a real legal problem. It is the one and only reason why there is still no possibilty to incorporate the SSPX in the diocese where I live. Even if the SSPX community would accept our bishop (which probably a lot of the member won't do because he is ordained in 1979 and I know a lot of the SSPX people in Gerwen don't believe his ordination was valid...) he cannot do anything for the SSPX priests as long as there is no solution about the suspension, and the suspension will stay when SSPX will not accept the conditions of the Pope and the Ecclesia Dei. The only hope is the 'Ecclesia supplet' and the 'common error' principle for the SSPX members...
Of course the SSPX members here will not like what I write. I'm sorry. And as some will know, I am not the only one considering it like this.