ContributionsMost RecentMost LikesSolutionsRe: Cannot Send with Thunderbird Don't believe Cox. I can not use the outgoing sever with Thunderbird but I can with the Cox email so their outgoing server must be working. I find Thunderbird help as offensive as Cox. I am going to try to find a replacement for Thunderbird which synchs with Cox. Does anyone know of a reliable provider to take the place of Thunderbird? I have always enjoyed using Thunderbird. Re: Cannot Send with Thunderbird I have the same problem. Cox told me to go to Thunderbird which I did. They like Cox only refer you to various web sites but do not provide a method to get a personal answer. I have given up. There are a lot of similar comments on the internet about this problem so you would think someone would fix it. In addition to the message you talk about I got a message that said Status: connected to smtp.cox.net with a green bar but it never finished.