I am trying to do something very simple but without success...

I can use variables inside the Mass Mailing e-mails such as "Dear ${object.name}" when I get "Dear John Smith".

However I cannot do this inside a button / hyperlink's href address.

I want the link to have a part of the customer's info in it. Something like: http://www.something.com/page/mypage?id=${object.id} to generate something like http://www.something.com/page/mypage?id=54675

Any clue on how to achieve this?

Thanks in advance!

Fernando