I want to send a group email but don't want the email addresses to be seen by each person can this be done?

i keep getting emails from my family and friends when i ask them they said they didnt send them so when i open them its a virus so how can i stop them

ps thank you

I have new laptop due to Trojan worms ruining my old one.  I have created 3 email accounts on this laptop but cannot find any place that will allow me to add my contacts manually.  It used to be so easy just a click and you were there ready to put in your information.   

thanks for any help!  

Does Outlook for Mac support the email "flagging" option if the computer is not running Windows?  (I am thinking of buying my first Mac laptop, and I'd like to be able to use this option, which my current laptop, a Windows system, supports.)
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