When sending email to all members, how to get username/first name to show

i am able to send out a mass email to all members on my site. However when I send the email it just says

Hello [[USERSFIRSTNAME]],

How do I get the name to show up in [userfirstname]

thanks

 

sure, don't give us any detail what your site runs on, we'll just guess

 

The easiest way would be to loop through all your emails and string replace the appropriate username into each mail before you sent it.