While it is possible to use the place holder {{amazonSESUnsubscribeUrl}} to place an unsubscribe link in the e-mail footer, it seems that best practice would be to include the one-click unsubscribe header as well.
Since Gmail is one of the two major providers that will soon require one-click unsubscribe, it's important to resolve this issue.
I noticed one major difference between the headers sent by an e-mail provider that successfully has their one-click unsubscribe header link visible, and Amazon SES.
The only unsubscribe header from a successful mailer directs to an unsubscribe URL:
List-Unsubscribe: https://manage.kmail-lists.com/subscriptions/unsubscribe?a=redacted
The unsubscribe headers from Amazon SES lead to a mailto unsubscribe and a separate post URL, which does not create a visible one click header unsubscribe link in Gmail:
List-Unsubscribe: mailto:redacted@amazonses.com?subject=https://o.us-east-1.user-subscription.com/oc/redacted, https://o.us-east-1.user-subscription.com/oc/redacted
List-Unsubscribe-Post: List-Unsubscribe=One-Click
I haven't tested Yahoo yet, however it would make sense to handle each case as required, particularly with the large mail providers that are imposing this requirement in February.
Does the
{{amazonSESUnsubscribeUrl}}link still work for you? I have noticed that with no changes on our side, SES is not replacing that placeholder in the email anymore.