Tricks : Custom unsubscribe options in emails

1. Direct Unsubscribe

If you want to include a link that a recipient can click to unsubscribe, that skips the unsubscribe landing page (options) and simply unsubscribes the recipient across that profile:
<a href="http://{~customDomain~}/_act/optout.php?id={~mailId~}">Unsubscribe</a>

2. Direct Unsubscribe (GROUP)

If you want to include a link that a recipient can click to unsubscribe, that skips the unsubscribe landing page (options) and simply unsubscribes the recipient across all the profiles in a group:
<a href="http://{~customDomain~}/_act/rcr.php?id={~mailId~}&optOption=OUT&optOutGroup=Y">Unsubscribe</a>