Probate Letters Yellow vs White, handwritten????

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Hi everybody,
Im targeting probate and I am getting ready to do some direct mail to the executors. I'm hearing some people say they use a white letter, is that handwritten or typed formally? On the other hand, some are saying they're going with the traditional yellow letter approach. Can anyone who is actually having consistent success with probated clarify. I'm outsourcing this task to a mailing house and I want to know how to do this right. Thanks everyone.