I just thought I would mention that although the advice given in the first post would ordinarily be sound, and one should always be very wary of pretty much anything received by e-mail even if it looks legitimate, this is one instance where deleting the email straight away might not be the best idea.
Apparently the email omega 1 received is a copy of a genuine email from BT (one that I received myself), but with some of the links changed. People with a BT email address who are no longer customers of BT for their internet services will lose access to their email in April. Apparently scammers have seen this as an opportunity to take advantage of some less careful folk.
In short, if you do not use BT as your internet provider but still have an email address like this:
@btinternet.com
@btopenworld.com
@talk21.com
then it's probably worth checking whether you need to do anything if you wish to keep it. There's some info at
www.bt.com/emailchanges