To reach the president, you have to go through a multi-step process. In the first characteristic step, you have to tackle the question whether your message is a "supporting comment" or a "differing opinion" -- really, it's either one or the other.
Following is a long form where you have to enter all kinds of information. Then you are sent a challenging message via email, to which you have to respond for your message to get delivered.
Clearly, this is email as it was not intended to be. Instead of making communication easier and more accessible, the White House's multi-staged process hinders it. Apparently, the system has reliability problems, too.