I would like to be able to add a link to a prior email message that we sent out within an email mesasge that we are about to send out. Whenever, I add a link to the prior email emssage and click on the link within a Test Email, it pulls the current email message rather than the prior email message that I want the recipient to see.
Whenever you add a link to a prior email message, it will contain the parameter of "MessageViewer". This parameter will automatically remove the msg_id of your prior email and replace it with ID of the email message you just sent. To work around the "MessageViewer", you cand add this parameter, &donottrack=true, to override it.
Your message link would then look like: sitedoamin/site/MessageViewer?em_id=xxxx&donottrack=true