How do I block messages from an email or url that keeps changing with every message?
How do I block messages from someone who uses an email or url as the from address and keeps changes it with every message?
[Re-Titled by Moderator]
iPhone XR
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Are they iMessages or SMS / MMS messages?
If the latter, contact your cellular carrier. They should be able to block email to SMS messages at the gateway, but it must be done by the carrier, you can't do it from your phone (note that this will block ALL email to SMS messages).
If the former, you can't block them entirely, but you can turn on "Filter Unknown Senders in Settings>Messages, which will turn off notifications for those not in your contacts and shuffle them off to a separate list.