Hi Beth,
In the source code repository I've added a config setting that allows you to disable the check for the unsubscribe token, so in the next release of mojoPortal you will be able to add this to user.config:
<add key="NewsletterEnforceCanSpam" value="false" />
however that will be a global setting so if you are also using the newsletter for other purposes you will just have to remember to add the token even though it is not enforced in the editor.
Hope it helps,
Joe