Somewhere in between the latest Thunderbird update and me switching broadband providers from Virgin to Sky and back to Virgin again, all in the space of about a week, this problem has developed with sending emails. At first when i switched from Virgin, I got a message that my NTL email address would no longer work after 90 days, as it was owned by Virgin. Each time I wanted to send from my NTL account I got a pop-up message asking me (Think I recall correctly) to insert my NTL password. I ignored it and switched my sending email address to my gmail email account. Now I find difficulty sending both in Gmail and in Virgin, sometimes having to wait several minutes for the email to go, sometimes it not going at all, other times waiting for a copy, then occasionally "can't copy to the "sent" folder so save in "Local Folder". I would be grateful for advice how to revert to the previous excellent service i always had with Thunderbird.