Dittofeed comes with a number of built-in liquid tags, filters. These are available to use in your templates. These serve as useful utility functions for rendering messages.

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Tags

The unsubscribe_link tag outputs a link to unsubscribe from the message’s subscription group. 
{{ unsubscribe_link }}
This renders a link of the form, 
<a class="df-unsubscribe" clicktracking=off href="..." target="_blank">unsubscribe</a>
This tag is only usable in templates used within a journey message node that has been assigned a subscription group, and will otherwise produce an empty href. The link’s text can also be overridden by passing a parameter to the tag e.g. 
You can unsubscribe by clicking {{ unsubscribe_link here }}.
Including an unsubscribe_link is critical for marketing emails, for both legal and user experience reasons. It should be included in the footer of your email, along with your company name, and address e.g. 
<mj-text align="center" color="#525252">
  MyCompany, Inc., 40 Rosewood Lane, New York, NY 10003
  <br/>
  <br/>
  Don't want to receive these emails? You can {% unsubscribe_link %} from them here.
  <br/>
  <br/>
  Powered by <a href="https://dittofeed.com" target="_blank" rel="noopener noreferrer">Dittofeed</a>.
</mj-text>