someone registered same icloud account and their email sent to my inbox

Hi everyone,

I’ve had an email address with the @me.com domain since before Apple launched @icloud.com. At the time, I recall Apple mentioning that both @me.com and @icloud.com would be merged and could be used interchangeably.

However, I was recently surprised to see that someone else has registered the same username under the @icloud.com domain, and their emails are being delivered to my @me.com inbox.

This has made me quite anxious—if I can receive their emails, could they potentially receive mine as well? I would really appreciate any clarification or advice on this.

Thank you!