I'm at my wits end. One minute I can send emails and the next I can't. I've checked Incoming mail details, Outgoing mail details, port numbers,checked server settings a hundred times, about:config & extended the time, googling server timing out, . I have seen it's been a problem, but for the life of me, I cannot fix it. I use Mozilla Thunderbird and optusnet. Does anyone know how to fix it?