Hello Marketo Community!
I am still learning how Marketo works and just recently made the mistake of re-uploading a list that had been used for an email send from the previous week. I understand by doing this that dupilicate contacts can be created and bigger problems can occur.
Could someone offer a solution on how to fix this problem?
Additionally, could someone share some insight on why a previously uploaded list should never be reuploaded into Marketo? I'm trying to get some context on my error.