Is my email being hacked into?

I was checking my emails on my iPhone and for one of my accounts a pop up said something like "POP3 verify your account info" but my account is up-to-date. I can login into it and send and receive emails fine. So why did that pop up appear if everythings fine? Was I getting hacked? Answers will be appreciated thanks.

If you feel suspicious.
IMMEDIATELYCHANGE YOUR PASSWORD.

And POP3 Post Office Protocol
Is a protocol by which supports simple download-and-delete requirements for access to remote mailboxes.

And no you were not getting hacked, :)

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