Why the e-mails?

I have posted a couple of times and now I seem to get e-mails on all
the posts being made on the board. They are interesting, but I'd
rather not get e-mails on all posts because I check the message board
several times a day. I suppose I clicked something that activated the
e-mails. Can you help me with this? Of course, I do want e-mails
concerning any posts that I make. Thanks.