Three different situations can cause the spMailingID, spUserID, spJobID, and spReportId to be appended to the end of URLs.

For Example:

1. If the URL is listed as a qualified domain under your web tracking settings. (Settings > Administration > Organization Settings > Web Tracking Settings) When you include this domain in your URLs, the Acoustic Campaign will automatically append the spMailingID,spUserID, spJobID, and the spReportId parameters to the URL so the click can be tracked from the email to the webpage. To track the webpage visit, you must also add the web tracking code to the page's source code.
2. If the links are clickstream links.
3. If the link is a landing page link.