I've been on both sides of this. There were a few instances when I had chosen not to include a link (most of the time I'd try to respond with an explanation of why it wasn't linked); I've also sent emails to newsletters but not have what I sent in linked.

It never feels good to not have your link posted, there's no way of getting around that. But maybe knowing why would help? Personally, I don't mind people emailing me wanting to know why what they sent in wasn't linked, and 99% of such correspondence I've had had been polite and cordial. Of course, I can only speak for myself here...