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In the email message, usually in the footer, an unsubscribe link is provided. A cancellation handled outside MailUp generally follows either of these procedures:

1. A link to an URL pointing to an external unsubscribe page is inserted into the email message;
2. The message contains a procedure allowing the user to unsubscribe (e.g. "To unsubscribe please send an e-mail to [...] with "UNSUBSCRIBE" as a subject header").

In order to keep the database updated and avoid sending unsolicited messages to users who unsubscribed, MailUp administrator must then remove the address from subscribers in one of the following ways:

• Manual import of unsubscribers list (in csv/txt format)
• Call to API procedure xmlUnSubscribe.aspx (see Get/Post API Specifications)
• User manual unsubscribe via MailUp interface
• Manual import of unsubscribers list (through copy and paste)
• Automatic import of a list of users to be unsubscribed via Batch FTP procedure (i.e. every night) 

As an alternative, the administrator can avoid removing those users, but before every mailing a list of contacts without the unsubscribers must be imported to MailUp in a specific group, and the message must be sent to that group only. This procedure is more risky anyway, as the chances of sending an unsolicited message to a user who chose to unsubscribe are higherWe recommend that you always include a MailUp unsubscribe link in any message sent via MailUp (unless the message does not require an unsubscribe, which is very rare).

In some cases, however, some MailUp users elect to use an unsubscribe link that points to a different system (e.g. an internal CRM), or not to include an unsubscribe link and provide the recipient with different unsubscribe instructions (e.g. "Reply to the message with...").

In that scenario:

• the must unsubscribe preference is passed to MailUp as soon as possible
• There are many ways to do so, and they are listed here 
• A risky alternative is not to update the MailUp system with the unsubscribe preference (not recommended!!), and instead do the following:
  • Import the unsubscribed recipients into a dedicated Group right before sending the next campaign
  • Exclude that Group when choosing recipients for the campaign
  • In this setup, the Group works as a suppression list for that campaign