There’s a defect in Verizon’s MMS systems, that allows spammers to spoof MMS messages onto the network with “xyzvzw.com” as the domain name in the MMS packet, n

There’s a defect in Verizon’s MMS systems, that allows spammers to spoof MMS messages onto the network with “xyzvzw.com” as the domain name in the MMS packet, no phone number at all, and then Verizon’s matching system only checks for substring “VZW.COM”, so the invalid messages get delivered (without a source phone number, showing up on your phone as a text from an email address). Since it’s processed as a system message, it’s guaranteed delivery, and their anti-spam system can only block phone numbers so it’s helpless too. I tried reporting this and they were incapable of responding to or following up on the problem report, though they did helpfully detail the MMS packet defects to me. Maybe one of their engineers will read this someday.