It has come to my attention that sometimes over the years the comment moderation function has been overly aggressive. It is not always clear why some comments get held in the queue. Sometimes it is due to having over some limited number of hyperlinks (no, I am not sure what that limit is). Other times it is completely mysterious.
Aside from the spam filter, comment moderation is almost never on, other than whatever level the default is for my blogging software.
I recently cleared a bunch of comments that I noticed in the queue. Some of these were rather recent, and some were up to five years old. So if a comment you posted some time ago never appeared, maybe it has now. Sorry it took so long!
If you ever post a comment and it does not appear, contact me and I will try to locate the comment and clear it. (See the “About” page of this blog for contact info if you do not otherwise know how to reach me.)