Using Nintex workflows 2010 with SharePoint 2010 - I have both a Site workflow with an email notification and a List workflow with a task notification exhibiting the same strange behavior. The From email address in the published workflow is <system>@<domain> however users receiving emails see <system>-pilot@<domain>. The -pilot is not in the current From field in either workflow. I tried also updating the body text to add some blank space in case a simple from email update is ignored by Nintex, but that did not work either.
Are there any known issues with the From field or email in general? Is this caching somewhere?