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I checked and Gmail only allows filters on the Header From, not the Mail From. As @HatBeard says, just keep reporting as Spam and you might see some improvement on the heuristic filters.
@Greenbank Sendgrid are less of an issue than they used to be since they brought in two factor. It used to be that high reputation, compromised accounts were rife with phishing, so were hard to spot/block using heuristic means. Since the change, only the crappy freebie instances are really being used, which come with low/minimal reputation and most filters will block most attacks. But, as good as Google is a lot of the time, they will make a change somewhere and overnight you'll get flooded. Complain and then at some point they'll issue a silent fix and say "what are you talking about, I see no issue". I have one client where they are actively allowing spoofing of a protected domain from a very specific .cz anonymous mailer tool to Gmail accounts. Told them about it and they just said, "yeah, that's intentional". Fuckers.
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stevo_com
Not a hardware thing but Spam.
How can you use GMail blockers to get rid of 'Via' Spam? I'm getting a lot of spam but blocking the senders doesn't work as they continually change email address.
The consistent thing is 'via sendgrid.info' (See screenshot). How do I block sendgrid.info?