This warning will appear when there are either an unsubscribe, edit profile or confirm subscription link in the email which is setup incorrectly.
Typically, this happens when these links have been:
- manually entered, or
- by copying and pasting a link URL instead of using the wildcard tool in the toolbar
To correct, this it is recommended to locate all links of this nature in the message and remove them, then use the widcard tool in the editor to re-insert them.