Blocking spam SMS from Jabber contacts

Hi, I keep receiving spam SMS from Jabber. I do not have Jabber myself; iMessage consistently identifies them as coming from Jabber when I check the info. They do not have associated phone numbers and therefore I cannot block them through the standard blocking feature.

I do not want to filter non-contacts. I get a lot of important/useful texts from businesses and non-contacts that are time-sensitive, like for deliveries. I only want to stop seeing these spam messages.

Is there any way to specify that any SMS coming from Jabber should be blocked? Or am I out of luck and will just receive these nearly every day forever with nothing I can do?