[Teli]

thanks for your help. I was already on the right path when I saw your response. Here's what I did

function mailOpen.QueueDelete(mailId,forceDelete)
    table.insert(delQueue,{['mailId']=mailId,['forceDelete']=forceDelete})
end
function mailOpen.ProcessDelQueue()
    if delQueue[1].mailId ~= nil then
        DeleteMail(delQueue[1].mailId,delQueue[1].forceDelete)
        table.remove(delQueue,1)
    end
end
 
 
function mailOpen.Test()
    for k, v in pairs(mailOpen.mailInfo) do
            if v.unread then RequestReadMail(v.mailId) end
            mailOpen.QueueDelete(v.mailId,false)
    end
    mailOpen.ProcessDelQueue()
end