It was your choice to determine how you were going to read the community when you originally joined. You chose your e-mail preferences yourself, that is why you are receiving mail from everyone who posts a message. We cannot change your settings for you.
To correct the situation, all you have to do is to go to the What's New Page, click on My E-Mail Settings, and then change your option back to it's default "On The Web".
You can also go to the Member Tools area in the left-hand frame and follow the same procedure as above.
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