Follow the steps below to customize your email tracking link headers.
In Marketo, click Admin.
Scroll down to Custom Header Options. Choose your desired settings and click Save Changes.
|Strict-Transport-Security||Use this to guarantee tracking links will always be served over HTTPS (should only be set for subscriptions with tracking links secured by SSL)|
It’s important to review these settings with your IT team to determine what your organization’s policy should be set to. Incorrect settings can prevent some visitors from accessing your Email links.