MAIL delivery services generate almost half the Koroit post office's income, Australia Post documents have revealed.The income figures have emerged as the mail authority moved to hose down what it maintains are baseless "rumours" that it plans to close the post office. Concerned residents have released the figures to show that Australia Post's stated plan to potentially move the post office's delivery service elsewhere would make the business unviable.Save the Koroit Post Office Working Party member Debbie Buckle said the income mix document for 2007/08 showed that 46.9 per cent of the Koroit outlet's income came from the delivery side of the business. Mrs Buckle said the remaining revenue from the postage, agency and retail components left the business unviable for licensees Kevin and Fran Lee. "So that's what they (Lees) are going to be left with," Mrs Buckle said.The intended sale of the business was scuttled last year after Australia Post revealed the delivery service could one day be relocated to Warrnambool. Mrs Buckle also referred to a letter sent by Australia Post in 1994 when the Koroit outlet was changed to a licensed post office."Currently we have a situation where our mail business is profitable but our retail business, ie our post office counter operations, is operating at a significant loss," the letter said.An Australia Post spokeswoman said the income derived from the delivery service "is nowhere near the amount" suggested.