Zaid Alsalami, Shaykh Dr Zaid Alsalami is an Iraqi born scholar, raised in Australia. He obtained a BA from Al-Mustafa University, Qom, and an MA from the Islamic College in London. He also obtained a PhD from... Answered 1 year ago

Bismihi ta'ala 

Yes, it is permissible to pray behind a Sunni Imam, for the purpose of Islamic unity. Of course, details of this issue must be taken from the specific fatwa of your Marja' taqleed.

And Allah knows best.