There are hundreds of ESPs out there. The easiest way to identify who is using which is to sign up for an email and then check the CNAME of the link domains, and the MX records of the sending domain (likely will be something like mail3.nysun.com rather than nysun.com).
Quote:
Originally Posted by Rochard
For example, if someone is using YNOT Mail all of their links in their emails start with ynotmail.com. This is for tracking services.
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Who uses their ESP domains in their emails without cnaming them?
