Looking for opinions, or even better, research, from the community.
In an email answer-back for account creation, you frequently have an opt-in link to confirm it was really the controller of the email address signing up for a service.
But in the case of a typo, or malicious sign-up, I've seen both "If you didn't create this account, just ignore this email" and I've seen "If you didn't create this account, click *this* link to let us know."
In the negative case, which is more common? I'm of the opinion that "click this link to deny" just trains users to click on links in emails they aren't expecting, which is good for phishers, but bad for us. I prefer the "just ignore this email" approach, as more secure.
But having a discussion with a coworker, they said that "click this link to disavow" is a common pattern.
What say you all?