Event triggers are powerful way to do automated actions in your WordPress auto-responder when certain events happen. This page explains the event triggers in the Intelligence module for Arigato RPO:

Subscribes to is a pretty obvious trigger. It fires immediately when a subscriber subscribes to a selected mailing list.

Unsubscribes from, similar to the above fires immediately. It lets you subscribe the user to another list (not recommended without their agreement!), automatically unsubscribe them from other lists, etc.

Clicks on is a trigger that fires immediately when the subscriber clicks in a trackable link inside the email message. Trackable links are another feature enabled by the Intelligence module. It lets you track clicks and CTR on links that you insert in your messages.

Does not click on is a pseudo-trigger that is executed once daily. There is no event “not click” on a link but with these pseudo triggers you can select that something will happen if the user does not perform an action within X days of their registration. In this case the trigger means: do something if the user does not click on a selected link within, for example 30, days of their registration. It does not matter in what email message the trackable link is sent, how many times it is sent, or even if it is not sent at all. If there is no click from that user after X days, the trigger fires.

Reads autoresponder email is an immediate trigger. It fires when the subscriber opens the selected email. Note that these triggers are not reliable as many email programs ignore the hidden image that we use to track email openings. There will be false-negatives, so don’t use the trigger for anything too important.

Does not read autoresponder email is another pseudo-trigger. There is no real “event” here but you can create this daily trigger that will check once per day if the subscriber has opened the selected autoresponder message. If after X days of their registration they still have not read the email, the trigger fires. As with “reads autoresponder email” trigger above, these two triggers are not reliable. There will be false-positives.

Stays subscribed in is a daily trigger too. Once daily the program checks if the subscriber is still with us. You can select that if she stays subscribed for 180 (for example) days, she may get tagged as long-term subscriber, moved to another mailing list, or something else.

Receives autoresponder email is an immediate trigger. It fires at the moment a specific message is successfully sent to the subscriber from your server. There is no guarantee that the email has been read.