The Royal Mail is to switch to a single daily delivery in Brighton and Hove from Tuesday.
Customers in the BN1, BN2 and BN45 areas will receive all their post in a single delivery by lunchtime at the latest.
The Royal Mail said most mail would be delivered earlier, with deliveries starting from 9am.
The move is part of a switch to single daily deliveries everywhere in the country.
A spokesman said the second post was costly and represented only four per cent of mail delivered every day.
He said: "It makes sense to combine first and second deliveries.
"The changes will help safeguard Royal Mail's six-day-a-week universal service to all 27 million addresses in the UK."
Customers who want their mail earlier will be able to apply to collect it from the delivery office from 9am without any extra cost.
Delivery arrangements for business customers will be unchanged.
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