Just a word of caution....even a nice gesture as a birthday card can be viewed as a negative.
A marketing team at a bank I used to work for did something similar to that and it actually caused real problems. The list was not 'screened' well so, the offer was mailed to customers that had just been denied for a loan, who were in collection/bankruptcy/foreclosure, who had just closed deposit accounts for "bank errors", "bad service", etc.. Some customers complained bitterly by writing to the CEO because they felt the bank was being insincere and vindictive. It was sad that something so well intended wound up feeling so bad. And it was not inexpensive to execute. They stopped it after a few months.
I'm sorry for being so doom & gloom about your plans and I hope you don't experience the same problems. Good luck to you.
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The views, opinions, & judgments expressed here are mine. The contents have not been reviewed or approved by my employer.