Deactivation risks and reactivation promises unkept.
There’s a very simple answer to this one: no.
Even if the answer is yes, the answer is no.
Let me explain.
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Reactivate a deleted account?
Once you delete an account you should make zero assumptions about what will be preserved should you change your mind and want to reactivate it. The best approach is to pretend you’ve deleted it, act as if you’ve deleted it, and see if it matters. The only assumption you can make is that when you delete an account everything is gone immediately.
Make no assumptions
We might think we know how long Yahoo! (or any email provider) will hang on to your account in case you change your mind. It might be 30 days, 90 days, or something else.
It might also be zero days.
The real issue is, the answer could change tomorrow. If the answer becomes zero tomorrow, any decisions we make today are invalid.
And, no, I don’t think the answer will change to zero tomorrow1. But there’s such a simple way of avoiding the problem completely that I think assuming it’s zero is by far the best approach.
Assume the answer to your question is “no”. Assume that the instant you delete your account it’s gone forever.
What might you do differently?
I suggest you pretend you closed your account.
Seriously: stop accessing it, stop using it, stop giving that email address to anyone. Pretend that you closed it simply by acting as if it isn’t there. Maybe sign in every so often to make sure the account doesn’t go away for lack of use. But otherwise, be absolutely religious about not using it.
Does it matter? Do you find yourself returning to the account for some reason? Then you’re not ready to delete it.
On the other hand, if you never notice or care, then all is well. You can delete the account, or you can just stop logging in to it and let the service purge it eventually for lack of use.
Either way, your destiny remains firmly in your own control.
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Footnotes & References
1: Though, depending on the email provider, who really knows?