I've never had an issue uploading lists until yesterday when two separate lists have failed to upload. Marketo support is saying there are special characters in the list and that @ and . are included as a special character. That makes no sense to me because it's an email marketing platform so an @ in an email address shouldn't block an upload. Plus every list we've ever uploaded has an @ in the email and separates phone numbers with periods.
Any help would be great!