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Sign up to their email list and check out their emails. Nine times out of ten you can tell what they are using just by looking at the links they send in their emails.
For example, if someone is using YNOT Mail all of their links in their emails start with ynotmail.com. This is for tracking services.
They also could be using something internal.
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“The choice is no longer between right or left. The choice is between normal and crazy.”
- Sarah Huckabee Sanders
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