i wanted to use merge fields in visual force email template.It worked fine for relatedTo.name but it doesn't work for relatedTo.address

<apex:image url="https://na1.salesforce.com/resource/1259064527000/Header"/>
   <b>{!relatedTo.Name}<br>
      {!relatedTo.address}<br>             <-here it doesn't work but previous line works perfectly

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WE CAN HELP!<br>

it display error as invalid field address for sobject lead.