I keep wanting to do that. I had four showers so I have ton's to write. I asked my mom and best friend, the both said no. I have to hand write them and send the announcements. I also have to write a separate note for people who all went in together to get one gift. To me that is awkward, I don't even know some of them (they work w/my mom).
Re: would this be tacky?
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I just did that and put ours in the mail today- killed two birds with one stone.