the link you posted here is in fact the link to advertisement and banners, this way PPRuNe receives some £ as a referrer.
The link to the mail should read
http://pprune.mail.everyone.net/ and leads to the mail-front page.
I am not sure whether this link has changed during the server-migration but you need to upgrade the link. Are you using modem accelerator? Let it update the addresses stored.
Hope this helps...
One more point, test a right-click on the mail-link on the PPRuNe welcome page and than OPEN IN NEW BROWSER, you may be lucky...