Royal Mail will be making some changes to the way it delivers post in the BN15 postcode area over the next few weeks, affecting Lancing and Sompting residents.
New delivery rounds will be phased in gradually, and Royal Mail will be writing to every household and business in the village to explain the changes.
According to the company, post will still be delivered in the morning and for a longer period during the day, meaning many customers will continue to get their mail by lunchtime.
The time customers receive mail will depend on where they live on the new route, and may be later or earlier than current delivery times.
A Royal Mail spokesman said: “The way in which we communicate with each other has changed dramatically. “Unfortunately, fewer letters are now posted every day and Royal Mail needs to organise its delivery routes to be as efficient as possible.
“We also deliver more larger items and so we are investing in new equipment to carry these items to customers even more securely.
“The new equipment also reduces the risk of injury to our staff from carrying heavier mail bags.
“These changes will require a period of adjustment for staff. However, Royal Mail will be doing everything possible to maintain a high level of service and thanks customers for their understanding.
Those with queries about the changes can call the Royal Mail customer services team on 0845 601 1399.