Please read the sources here. They are pretty mainstream within Orthodox Judaism: Mishnah, Talmud Bavli, Rabenu Nissim, Yosef Messas, and the Shulkhan Arukh itself (which, on this topic, Ashkenazi reject), and R. Ovadia Yosef, Yaakov Peretz, etc
http://files.ctctcdn.com/64c06db0201/e0c28217-2deb-444c-9e34-f3089c5fb520.pdf