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Including an unsubscribe link in your email is easy. In fact, unusubscribe links are required by law. Here's how to include it:
unsubscribe linkTo include an automatically generated unsubscribe link you just have to write %%unsubscribe%% in your code. You'll probably want to include it in an anchor tag like this:
<a href="%%unsubscribe%%" target="_blank" linkname="Unsubscribe">Click here to unsubscribe</a>
For a list of other things you can have Serious Email include see here: How to Dynamic Content in Your Email.