[baudehlo]

Super curious about this response saying on gmail you have more control, because from where I am the “mark as spam” button does nothing but move things to the spam folder. In theory it should learn from that but when someone used my email address to sign up for AT&T no amount of marking things as spam will stop their emails landing in my inbox.

[fencepost]

As in signed up for AT&T service? If so it's because it's not spam - it's misdirected mail, but there are tens of thousands of other Gmail users who think that messages almost identical to those are things they absolutely want to receive.

[RandomBacon]

If there is no business relationship between AT&T and that user, the U.S. Can Spam Act defines it as spam.

Shame on AT&T for not validating their customer's email address.

I too get the same type of spam from AT&T.