IP Access Notification WordPress Plugin
Sends out an email to the blog admin when a user accesses the blog with a certain IP address. The email will be sent out only once a visitor’s browser session to avoid email spam to you. 
There’s only one thing to be edited in order to make this work properly. Line 14:
That’s where you put the IP(s). If you want to check for more than one IP, add more like that:
You may also find this plugin helpful: Cookie Access Notification
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Tags: email, admin, frontend, notification, ip