To personalize a thank you letter, you can write a quip or statement that fits the employer's culture, or mention something in the note which was mentioned in interview, but be careful as one wrong statement could damage or jeopardize your chances. It's a great way to seal the deal, as it shows your commitment and ambition to get the job and start working for them right away. Don't forget to send it to just one employer, though, if you have time, send one to all the people who welcomed you to the