Best Practices to tie a Web Inquiry Form Lead to an Email Blast

You can set up a trigger-based smart campaign (make this a local asset in your program) to watch for a form submit from any member of the out-bound campaign where you sent the email out...Just say filled out form "not unsuscribe".

Also remeber to link your program to a SFDC campaign is the set up tab. This is wil give you what you need for multi-touch atribution, as this lead took multiple touchs to convert.

Putting the token query string on the end of every link (in your templates) will do the trick. 

?utm_source=Marketo&utm_medium=Email&utm_content={{my.Email-Type}}&utm_campaign={{my.Websafe-Name}}

To understand more, check out this article & then scroll down to February 7.

http://community.marketo.com/MarketoDiscussionDetail?id=90650000000PMGlAAO