So if an organisation emails you from no-reply@notifications.example.com, mailing-list@examplemail.com, and bob.smith@examplecorp.com, and the phisher emails you from support@example.help, which filter based on their from addresses makes all the legitimate ones show up as the same sender while excluding the phishing email?
Your assumption that they use more than one domain by accident due to a lack of coördination is not correct. Separating, e.g. your product email from your mailing list email from your corporate email has a number of benefits.
Anyway, I already mentioned a solid incentive for them to use the correct token. Go back and read my earlier comment.