One-click unsubscribe, as in a single click from an email with no additional interaction (no button click on the webpage), is obviously not a requirement of CASL.
I think one click should be totally safe as long as your trigger is "Visits Web Page" and filter on your unsubscribe page.
Not really because mail scanners also load the target page. (They have to, or they're not much good.)
Hi Port worx,
My recommendation would be to redirect leads to a preference center instead of directly showing them the unsubscribe confirmation page.
The preference center can be a valuable addition to prevent your leads from unsubscribing. Not only does the preference center helps you show the leads relevant options from which they can choose from, but its also enables the leads to go for options like a "90 day vacation", by which the leads would not be sent any email for next 90 days and post that also, the lead only receives communications on their areas of interest.
Additionally setting up a preference center is also highly recommended and mandatory in some cases if you have a data base that falls under the scope of GDPR. Setting up and giving options to delete ones own data, and other customized options become possible with the help of preference center.
I have worked with several clients and have had successful used cases where implementing an email preference center significantly reduced the unsubscribes and also enable us to send the right communication to the right lead.