Most people experience this problem with Hotmail. Check your junkmail bin. Sometimes they are redirected through the filter.
OR
If you are an admin of your board make sure that your current listed e-mail is correct.
Update The newest versions of AOL have the "advanced SPAM blockers" and may make it impossible for Proboards to contact you. Admins may have to manually register members who expierience this problem. Or we recommend that these people create temporary free e-mails (ie. hotmail.com).
if you have comcast do not use it here. you do not get the emails at all. from probards FAQs