In the last 2 days I too have received around 20 of these emails.
I have just changed my password to something more secure just to be on the safe side, but I hope vBulletin are looking into this.
The first load of logins attempts were on Wednesday night, and then tonight (thursday) they started coming through again.
The person/bot that is trying to login to my account must be using a proxy as the logged IP address changes on each login attempt. I did search a few of the IP's and most of them seem to be in China.
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