I checked the emails of those who have posted here, most of you are using hotmail/yahoo/gmail free email accounts. These have been known to have issues receiving emails form vbulletin forums.
If you can try changing to a different email like a work email or an ISP one (bell.ca etc) and see if your issue goes away. This typically is due to a setting in the free email servers settings and they can actually reject an email without you even knowing it is happening as it does not go to your spam at all.
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