The answer
Baptism is necessary for everyone because, " He who believes and is baptised will be saved " (Mark 16:16), and without it no-one can enter the kingdom of heaven (John 3:5).
The bestowing of the Holy Spirit in the sacrament of the holy anointing is necessary for all. And the Church has been doing this for all believers since the time of the apostles (Acts 8).
Similarly, the sacrament of repentance is necessary for all people, because nobody is without sin.
Also the Eucharist is an essential sacrament for everyone, since the Lord says: "unless you can eat the flesh of the Son of Man and drink His blood, you have no life in you. " (John 6:53)
The sacrament of the priesthood also has a bearing on all people. It does not only apply to those who are ordained as priests, but is relevant to all believers in that they receive the blessings of all the seven sacraments by way of the priest, whom we call the 'servant of the mysteries'.
We could talk about the sacrament of marriage for example, though it is clear that some people do not need this sacrament themselves, since they live without partners. Nevertheless, even those who are celibate are the fruit of the union of man and woman.
So the sacrament of marriage and that of priesthood, although not practised by all people, are notwithstanding of benefit to all, and they are essential to the Church as a whole.
The sacrament of anointing the sick is necessary for the sick only, and if a person never receives it, perhaps because he has never needed it, this obviously will not affect his salvation.
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Thrice-Blessed Pope Shenouda III of Blessed Memory