mass email sender sends to empty recepients?

Ovidiu Silver
Supreme Deity
Lifetime member
Mind-Blowingly Helpful
2349
#30

I sent out an email with a link to a poll to all members and checked the result in a plugin called email log that logs all emails going through a wordpress installation. the screen shot is attached. every 3rd or so recipient is empty? I am not sure what happened here...

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