When click tracking is turned on for a transactional email, the URLs are converted into trackable URLs that typically look like this:
Here is an example of a click-tracked URL that is both base-64 encoded and includes the MD-5 hash. Notice the addition of the h= parameter and that the l= parameter is now a base-64 string:
A URL with click tracking that is NOT base-64 encoded but includes the MD-5 hash looks like this:
URLs with base-64 encoding look more professional and recipients are more confident when clicking them. URLs without this encoding clearly show one URL that has another URL as a parameter, which can make a recipient more hesitant to click. The MD-5 hash prevents tampering with the destination URL. If someone were to change the l= parameter in a URL that contains the hash, then the user would NOT be redirected to the destination URL.
To set click-track settings, go to Settings --> Tracking --> Click Tracking
The importance of setting up a custom tracking domain.
All new JangoSMTP accounts will have both of these settings on by default. If you are a current client, we recommend that you turn on both of these settings now. Please note that JangoSMTP will enable these two settings for all existing accounts automatically over the next few weeks.