When going through your email reporting data, if you feel like you're missing sales attribution to one or more of your emails, one of the first things to check is that EVERY link the email that gets sent has tracking parameters (UTM values).
We recommend opening the email and looking at each link. Even better, would be to send yourself the email, so you can click on the links. When you click the link, you will want to verify that the page you end up on, still has UTM tracking parameters.
You will also need to make sure that the page the link is going to needs to have the Wicked Tracking Script on the page too. The Tracking Script is needed on all pages, optin forms, order pages etc...
If you cannot add the Wicked Tracking Script to a page, then the link going to that page needs to be a Wicked Redirect Link, for example...Amazon, FaceBook, PDF files... Go here to create one: Wicked Redirect Link
Note: We've seen many times where a link in an email ends up being a redirect link and when the link redirects, it strips the tracking parameters from the URL. If this happens we will not be able to track, you will need the final destination URL to add UTMs to the link for us to track.