I did this on one site of mine. I sent the signup confirmation from my real email account at the company and made it a personal letter from me welcoming them, w

I did this on one site of mine. I sent the signup confirmation from my real email account at the company and made it a personal letter from me welcoming them, while at the same time being an automated form letter (and not trying to disguise that fact). I mentioned that if they had any questions they could just reply to this email and then I signed the email with "Regards, <myname>". The site wasn't very big and it's now getting no attention from me, but of the hundred or 2 who signed up, a few responded. The email was basically: Hi <username>, Welcome to the site! To confirm your email click this link: <link> We've just launched this site and are working on developing new features now. If you have any feedback or comments, just reply to this email. It would be a delight to hear from you. Regards, <name> <startup> Founder & CEO