So you want to send an unsolicited e-mail to me asking me to do something for you without providing me an opt-out? Personally, I would be closing my account the next day.
I think you need to weigh new customers like me versus any perceived benefit you are going to get from a rating/review on Google. People don't walk into a bank based on some review on Google. They do it because somebody personally recommended the bank or it is right around the corner or other brand marketing has created a good image.
People detest unsolicited e-mails and nothing like teaching your customers to read and act on unsolicited e-mails that say they are from the bank.
But that is just my personal opinion.
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