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I still have RocketMail address, because when they were bought by Yahoo* they promised to honour all of their existing accounts for life.

So, Yahoo can never delete my @rocketmail.com address, and I still occasionally log into it just to annoy them :)

**** edit, I just tried to login, and it's not accepting the 5 digit code that they texted to my phone. Thanks Yahoo!

* (to form the basis of Yahoo Mail, in the same way that Hotmail was bought by Microsoft a month or so before that)