Spam always comes as a text to my phone from emails. It looks as if they are sending it to me to my MTS phone "email" email@example.com. Is there a way to block all messages that come through with that address?
What kind of companies are you receiving messages from in terms of the Spam? If it comes from a certain company you can always reach out to them and see if they can remove you from their mailing list. Could you provide some more background on these messages, please.
To my knowledge, there is no way to stop messages of those kind completely or add them to any block list. Depending on your device, it may be a function of that operating system independently but there is not way to do it from a network level.