Is it possible to add automatically utm value to all email URL ?
Not within Marketo. I know Hubspot has the option to automatically add utm values, and believe it or not, our digital manager found it to be a pain in the ass because random values ended up dirtying his reports.
If you really want to do this, you can set up a server side rewrite config, e.g. .htaccess on apache.
Oki doki ! thanks Jay ! I'm not really familiar with Marketo but how it's possible that an automation tool doesn't have automation tagging