I had signed up to receive notification for all posts. However I got only one email from the_watcha. Kevin replied later and I did not get his email.
I noticed the same issue in other YAF thread where bbobb replied and other replied to my thread and I only got the first reply. I did not get the second and third reply.
I am guessing this is a bug. I was expecting to receive emails for all post in that thread (since I started it and signed up for notification).
I have universal interwebz law that disallows my name to be associated with anything that could potentially be deemed "spam".
I wasnt even thinking spam as the possible reason for not receiving emails. I think if YAF plugin (blogspam) marks it as spam, others would not be able to see it unless someone approves the post.