[fauigerzigerk]

It's not DNS alone. In the Gandi UI you can set up a so called "web redirect" which results in an A record pointing to one of their http servers that does the actual 301 redirecting. If that http server is down, the redirect won't work.

[tym0]

Yes it was badly phrased from my part, I should have said: "My DNS record for www.example.com works but the web redirection I have from example.com to www.example.com doesn't work."