>> They were going to get a 4xx anyway. I changed the message to *help* 
>> SendGrid.

Yes but if you can change the message for SendGrid only, you can accept the 
mail and let it through

>> Where do I find out what the IP/domain is? Is it in my mail logs,

Apparently you were able to send custom text to just SendGrid.
Then you have some rule to be able to differentiate SendGrid mail from other 
mail.
Thus you just accept it.

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