${unsubscribe.Click Here} will add the link to unsubscribe the newsletter. "Click Here" is the link text

Remember the most important goal with emails is that they are opened 

Whether you are composing an email to one person or designing an email campaign to 1000's of recipients using the Email module, you should follow a few simple pointers to increase your Open and Read statistics;

• Your recipients are more likely to open an email when they recognise the sender, so make sure your sender address clearly identifies where you are from.
• A clear and honest subject line will illicit a better initial response, also builds trust over time that the recipients