Importing Previously Mailed Properties from Outside Pebble
You can most definitely import mail properties outside of Pebble.
To import the mailed campaign:
1. Create a campaign
2. Import your data as if you were importing a mailing list.
3. If you do not want to mail to this list through Pebble, then you can delete the campaign and the properties that are part of that campaign will still stay listed on the properties page.