msg from ubuntu list?

[Mihamina Rakotomandimby]

jack wrote:
> I received an email this morning telling me that my subscription to the
> ubuntu list was being cancelled due to 'excessive bounces' and that I
> should reply to the email and register for the list again.  Anyone else
> gotten one of these, and how can I find out if it's legitimate ?

You can always look at the "source code" of the message, and see if 
there is anything suspicious.
EMails sent to you also bounce because of some downtime of all the MX 
servers of your email service provider.