Trial mail delivery patterns are being introduced in Sussex which will lead to the scrapping of the second post.
Troubled postal group Consignia said pilot schemes will begin in 14 areas, including Crawley and Newhaven, after agreement was forged with the postal workers' union.
The trials will start from the third week of July and last for about two months.
It means residential customers will get a single delivery between 9am and lunchtime and businesses will receive their post between 7am and 9am.
A national roll-out of the programme will follow in the autumn.
Chairman Allan Leighton said single deliveries will save the company £350 million a year.
He said the second post accounts for four per cent of total mail delivered but uses up to to 20 per cent of the cost of all deliveries.
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