It would be a terribly insecure system if the link could make this action happen. People will "like" all the stores that they did not want. Imagine how easily companies could send an abbreviated URL to Twitter and get hundreds of illegal โlikes.โ
Itโs better to let people do it explicitly, so from email you can best link people to your facebook page and hope that they click. If this is a good / useful page, most likely they will be.
One approach is for the email to be targeted so that people get to the landing page on your own site. After that, you have a similar button, and with the help of Open Graph Protocol metadata tags are related โlikeโ to the home page or the whole site.
If you want your similar button on the landing page to be common for the whole site, use the canonical og: url meta tag, for example:
<meta name="og:url" content="http://yoursite.com/" />
roborourke
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