Postal.lua

local addonName, ATOM = ...
local Module = ATOM:NewModule('Postal')

local CollectableItem, CheckMailbox

function Module:OnEnable()
    self:RegisterEvent('MAIL_SHOW')
end

function Module:OnDisable()
    self:UnregisterEvent('MAIL_SHOW')
end

function Module:MAIL_SHOW()
    if not _G['ZygorGuidesViewer'] then
        ATOM:Wait(function()
            CheckMailbox(GetInboxNumItems())
        end)
    end
end

function CollectableItem(index)
    local _, _, _, _, money, CODAmount, _, itemCount = GetInboxHeaderInfo(index)

    if money > 0 or (itemCount and itemCount > 0) and CODAmount <= 0 then
        return index
    end
end

function CheckMailbox(index)
    if not InboxFrame:IsVisible() or index <= 0 then
        if select(2, GetInboxNumItems()) == 0 then
            -- MiniMapMailFrame:Hide()
        end
        return
    end

    if CollectableItem(index) then
        AutoLootMailItem(index)
    end

    ATOM:Wait(function()
        CheckMailbox(CollectableItem(index) or (index - 1))
    end)
end