Automatically Append a Google Analytics Code to Sales Emails Link

Aside from the data in Marketo, I use Google Analytics (GA) to track campaigns as a redundancy. Using UTM codes in marketing emails I am able to track visits in GA that directly came from specific campaigns.

I also want to view visits that derive from my sales team in GA. We use the outlook plug-in so Marketo automatically appends it's cookie scripts on all the links. But is there a way for it to also automatically append a GA UTM code as well, even a simple one like "utm_source=salesemail"?

I know that asking my sales team to add a UTM code to every link they send is out of the question and just not realistic.

Thanks,