Okay now I'm paranoid again.... When this happened, I called in and and spoke with an agent, and I read them the ticket number and details of the booking. Then the agent asked for my birthday. And they were like, okay, this is another person, you just happen to have the same name. And I was told the line about the email address with the dot vs without the dot.
I was advised by the agent to disregard the whole thing.

Should I take any other action?