Include links when generating the text version from an html message!
there are still email users that get text emails. by pointing to just a link you are essentially not letting us track the email traffic via google. your google is set up for only the html versions.. this is a huge miss and I am not sure you communicate this effectively for those new clients using your tools. There needs to be at the very least tracking on the link or view online link that isn't event counted.
We spend a fair amount of time re-formatting our text versions as they don't include links and are poorly layed out! Would save a lot of time if the auto-generated text versions were better.