@keithmann
Without seeing the email header info it's impossible for us to tell on here.
Certainly if you weren't expecting a code, you should ignore it and not follow any links.
However, if you have requested one, it's probably safe.
O2 can confirm if you contact them Guide: How to find help & contact O2
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
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