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If you do this, please please please include an unsubscribe option on the email that doesn't require a login to "manage email preferences".

As a user, I do not want to receive an email like this at all, but I will forgive one if I can permanently opt-out with a single-click.

What advice can you give the OP?

What questions would you be willing to answer from someone trying to improve a service that you were using--or perhaps even paying for?

How would you like to see them phrased?

Some people are willing to give product feedback others aren't (like me). Recognise the latter quickly and don't bother them.