Same bot sending mail to all my characters at the same time...?

It’s been a week I receive a lot of mails from bots selling gold.
However, the point is I have 6 characters and ALL characters receive the mail from literally the same bots. Exact same name and time that the mail was sent to me.
I just wanna know how these bots know this much information about the player?
It is just weird when the mail was sent from the same bot at the same time to all of my characters…