According to the consensus of the Sunni scholars the Ahmadiyya sect are outside of the fold of Islam.
The following link is a fatwa issued by Al Azhar University in Cairo, Egypt. https://www.mail-archive.com/[email protected]/msg00802.html
Narrated Sa`d:
Allah's Messenger set out for Tabuk, appointing `Ali as his deputy (in Medina). `Ali said, "Do you want to leave me with the children and women?" The Prophet said, "Will you not be pleased that you will be to me like Aaron to Moses? But there will be no prophet after me."
Sahih Bukhari.
We, Shia Muslims, agree to this view.