At least one recipient does not have an email address or is marked as "Do Not Allow" email.

Hi everyone,

Firstly, I apologize for my inadequate English. I get such an error while trying to send a contacta mail to crm 2013:

I'm sure the contact's email addresses is right and email permission allowed are correct. 

(My CRM's language is turkish) İzin Verdi= Allow

What should I check, thanks in advance for your support.