The message asked recipients to reply to a fake email address for Mr Guy, before receiving further instructions.
"They're only interested in one response and that's a reply from which they can extract money," Mr Guy said.
Mr Guy came out of the council chambers yesterday to find voice messages from concerned recipients on his cellphone but had not heard of anyone being duped by the scam.
He said staff at Xtra felt the attack was random, unpreventable and computer generated.
He was able to keep the same email address, having changed his password, and said anyone who had not received a timely response to an email was welcome to re-send it.