Discouraging birds to keep them from settling on your mailbox posts is relatively easy.
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Perch a fake owl or hawk on top or nearby. If birds fly into range and suspect that a predator is on the prowl, they will be less likely to take up residence atop your mailbox.
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Mount a flag or pinwheel on your mailbox. The constant movement of a flag or pinwheel in the wind will confuse and deter birds.
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Spray the top of your mailbox with non-stick cooking spray. This will make the surface slippery, making it impossible for birds to settle in.
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Distract birds from your mailbox by setting up your feeders a good distance away from the mailbox. If you are actively feeding the birds elsewhere, they won't be so drawn to the mailobox.
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Provide quality bird perches and housing in your yard. Giving birds other appealing places to gather, display themselves and establish community will discourage them from adopting your mailbox.
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Get an outdoor cat. While most bird lovers would rather not harm the birds in their yards, having your very own outdoor predator on the loose will scare off birds.