When you sent the email, you may be rejected. You need to join meeting or off-fan meeting where you can meet them and talk. Then, you can ask the hallmark

Who are you looking for specifically?

I am having some trouble getting some autographs from the hallmark actors, I try to send my fan mail to the different agencies, and I try to send them an email, requesting an autograph picture and I never receive an email response, what should I do?