1. The file must not have column headers.
2. Please ensure that values in each row are separated by commas.
3. You can create a domain with any number of downstream addresses. The expected format for a downstream address is:
A downstream record represents the actual mail server hostname(s) being used to accept mail for this domain and tells MailChannels where to deliver your inbound mail after filtering.
Below is a sample Downstream Record CSV file entry for some example.com domains. The first entry/line adds example.com with a single Downstream Record entry. On the second line, we are setting up the example2.com domain with two Downstream Record targets.
NOTE: Multiple Downstream Record addresses for a domain are common and multiple entries must be contained within a set of double quotes "" as seen above with example2.com. Each domain must be added as a new line/row in the file.