[jakejohnson]

Exactly. Spammers can use any email address they'd like and Verizon simply passes it on to the recipient. A spammer used one of my domains (with valid SPF records added years ago) and texted thousands of Verizon customers. I intercepted all replies to the texts with a catch-all email and found hundreds of complaints including several death threats and a father who told me his young daughter received a porn text from my domain. After 3-4 days, their spam filter finally kicked in. My domain was blacklisted and I basically had no control over it.