I'm looking to nail down our sender score for a dashboard I'm putting together, and can't seem to get a straight answer on this.
The IP will appear in an SMTP Received: header of any Marketo email. Note Received: headers are prepended at every hop. Here, the third Received: refers to a *.mktomail.com hostname, so that's the public IP of that's the last hop within Marketo.
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