It is genuine. I just did it for mine yesterday.
I recently made a new secondary email ID at OneTel & had to make it in the format email@example.com. My main ID was firstname.lastname@example.org, now changed to email@example.com. HTH, G
An excerpt from the email - "Your email will automatically be forwarded to your new onetel.com
address until 1st September 2004 after this date your onetel.net.uk email address will cease to exist. After September 1st we will then return any emails attempted to be sent to this address and advise the sender to replace the onetel.net.uk part of your email address with