Any ideas anyone?

When I first installed thunderbird a couple of months ago I set it up for my vigin media and my google email addresses and it all worked fine. Then about a month ago it refused to send e-mails from my virgin media email address ( I can receive but not send). Virgin media said it was a password issue I had to use a third party e-mail address to log into my account and change the password. It has taken VM 3-4 weeks to create the new password for me. However Thuderbirds does to recognies the new password. I removed the VM email address for Thunderbird and tried to reinstall it but I can't as it says the pass word is wrong. The new password works in outlook and in the google e-mail browser on my phone and tablet but not in thunderbird, so nothing wrong with the password. I have read a blog from someone with a similar issue (except he could not receive emails from his VM address). He was recommended to create a new profile. I have done that and it still does not work. Any ideas anyone?