[Qt-interest] I get every email twice from this list

[Matthias Pospiech]

Since a view days I get every email twice. The subject is most times 
replicated with a "RE:". For example:

[Qt-interest] Qt 4.5.x debug,    VC9 and Windows SDK. exe will not run
Re: [Qt-interest] Qt 4.5.x debug,    VC9 and Windows SDK. exe will not run

but there are also examples  where the subject is identical in both. The 
content is identical anyway.

I have not changed anything in my client (thunderbird). The problem also 
exists in the Qt-Creator List.

Any idea what is going wrong?

Matthias