I sent an email autograph request to the television show "This Morning" on May 15th 2012, and I received a signed photograph of presenters Phillip Schofield and Holly Willoughby in the post on June 6th.
The email address I used was:
thismorning@itv.com
Here's the signed photo:
Here's the signed photo again with its envelope:
Rather oddly, the envelope has been stamped twice

Obviously went through the machine wrong the first time. I've never seen that before though!