Mr Hickey, a member of the national executive of the University and Colleges Union, used the email system to promote four meetings “hosted by the UCU, University of Brighton".
However, Brighton University has denied support of Mr Hickey’s initiative.
“The views that [Mr Hickey] has expressed on behalf of the UCU are not the views of the University of Brighton,” a spokesperson said.
“The university has fundamental disagreements with UCU on this matter.”