I attempting to place a merge field into a Custom Email Template. The template is related to the Lead Standard Object. Because I am working with Lead Fields, and I need to place the Lead Owner's Extension inside of the template.

     But I am running into a problem, only the following Lead Owner fields are available:

• {!Lead.OwnerId}
• {!Lead.OwnerEmail}
• {!Lead.OwnerFirstName}
• {!Lead.OwnerFullName}
• {!Lead.OwnerLastName}
• {!Lead.OwnerPhone}
• {!Lead.OwnerTitle}

     There doesn't seem to be a field available for the Lead Owner Extension field. I have attempted to use the following solution

• {!Lead.Owner.Extension}

     But, when I place it into the template and hit the save button, it will truncate the "Extension" portion of the merge field. Leaving only {!Lead.Owner} in the template.

     I am sure that there has to be a solution for this issue, but it is currently evading me. Any help would be greatly appreciated.