Currie finished the email by saying: "Alec, this matter has never been personal."
Robertson has said that under the proposals, either BT or CSC would be legally required to deliver at least £5 million of savings over the next two years and to create a minimum of 500 net new jobs in Cornwall.
Robertson said in a statement: "The reality is that both companies are offering to deliver even greater savings and create more jobs than we set out in the original prospectus which can only be good news for both the Council and people in Cornwall.
"I am hopeful that members will support the strategic partnership once they have access to all the facts. However, if I a majority of the council decide to vote against the proposal, then it will not go ahead."