[Juz]

I had the very same problem a couple of weeks ago after my installation.

What you need to do is add a SMTP server for each account and every time use that accounts address as the username for that particular SMTP server.

To do this goto Tools>Account Settings in Thunderbird and click on "Outgoing Server (SMTP)" at the bottom of the left hand pane. Then click on "Add" on the right and enter the server address (smtp.virginmedia.com) with the username >the accounts email address. Put a tick in the box marked "Use name and password" and select SSL under "Use secure connection".

Repeat the above for every account/email address you have remembering to use the same server name for each one but changing the username to match the address of each account. Then go to the properties of each account and near the bottom of the pane you'll see "Outgoing Server (SMTP) with a drop down box. Use this drop down box to select the correct server/username for each account . You can use the same method for non VM accounts, I still receive email on my old email address via my old ADSL provider.

Hope this helps and that I've explained it ok. I can assure you its possible as I am doing it. Remember that if you have other users of your PC that also have VM accounts that you'll have to setup their email in the same way.

Juz