domains = ['gmail', 'yahoo', 'outlook']

def isBusiness(st):
    domain = st.split("@")[1]
    res = True
    for s in domains:
        if s in domain:
            res = False
            break
    return res

joinedEventsFrame = joinedEventsFrame.merge(joinedEventsFrame['email'].apply(isBusiness).to_frame(name='isBusiness'), left_index=True, right_index=True)