Sorry this is so frustrating for you. I have reread all your messages, especially https://support.mozilla.org/en-US/questions/1480596#answer-1697659 which I see as the best description of your situation. [1] It sounds like you are consistently getting new mail. But still missing many older messages. Based on what you have posted so far, I conclude that it will not be possible to recover the missing messages, because a) you do not backups, and b) the missing messages are also not on the server. Unless you have some other source to get these messages? [1] "AOL: Can you see the missing messages when you log into aol.com? If not, do you have a back-up?" '''No/No ''' "GMX: Is the account working now? Can you see the missing messages when you log into Web mail? If not, do you have a back-up?" '''-Account is workin. I dont see missing messages.'''