I received a yahoo email which I need some clarification?

Questions: 1) Did Yahoo sent me that email? Just want to make it is not a spam. 2) I have already deleted many emails, and were able to send an email to myself. Do I still need to re-validate my mailbox? 3) I tried to get on to the link http://webmail-updating.com, it seems to be some bug there, so I am worry... show more Questions:
1) Did Yahoo sent me that email? Just want to make it is not a spam.
2) I have already deleted many emails, and were able to send an email to myself. Do I still need to re-validate my mailbox?
3) I tried to get on to the link http://webmail-updating.com, it seems to be some bug there, so I am worry this is a spam. Please confirm if I still need to go on that link?
4) This morning, I was unable to receive the email in my cell phone, has this anything to do with the storage issue?

Thanks.

Mary
Update: Thanks for the answer.

Can you please confirm if my email account has a limit on storage? Do I need to delete my emails regularly?

Thanks.

Mary
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