Recently I've noticed that when I recieve some sms texts to my number, there is a third party also being added unintentionally. It's at an address RCP[MyPhoneNumber]@unshp.org, an address I have absolutely 0 connection to. This is, understandably, a worrying breach of privacy.
I use facebook messenger for my sms texts. I've looked through the account settings, and haven't seen anything that would link my account to another's. I'm wondering if it's something on the network's end that is directing this user to recieve sms messages addressed to my number.