@Sanford Whiteman
1. For your internal attribution script, do you ever run into cases where the browser breaks the referrer page so the script doesnt pick up and update the medium field?
2. Is there and automated way to add utms to urls when sending marketo emails?
1. For your internal attribution script, do you ever run into cases where the browser breaks the referrer page so the script doesnt pick up and update the medium field? |
We don't rely primarily (let alone solely) on the referrer, preferring source-tagging whenever it's possible. But if someone links to your site from a blog or Tweet, they aren't going to include your UTMs.
As long as your destination site is running over and the source site doesn't make specific moves to strip the referrer (such as the referrer <meta> tag or bouncing traffic off an interstitial page to remove the query string), you will get referrer information. Privacy plugins can also be used by the lead her/himself to strip referrer information, but they can also strip UTMs, so I don't worry too much about that angle.
2. Is there and automated way to add utms to urls when sending marketo emails? |
There isn't. You can (and should) tokenize your URLs but you can't still force users to include everything you want. I wrote a bookmarklet once that scanned the HTML of a preview to see that all URLs matched a certain pattern. Problem is there are always exceptions, and if you know users you know they'll tend toward skipping steps if there's the option. 
